Archive for seth shostak

NASA Versus the Mayan Madness

Mayan temple
Bertrand Gardel / Getty Images

If you want to see a roomful of people roll their eyes, just walk into a gathering of astronomers — or experts on ancient Mesoamerican civilizations, for that matter — and shout out the words “Mayan Apocalypse!” For years now, the idea that the Earth will be destroyed in a terrible cataclysm on December 21, 2012 has been bouncing around the Internet and showing up in articles, books and even movies. It’s been the inspiration for get-rich-quick schemes. It’s like Y2K all over again, but at least that episode of end-of-the-world hysteria was reality-based.

The 2012 Apocalypse, by contrast, is just plain nutty. An asteroid is not about to hit the Earth. Neither is an imaginary planet called Nibiru. Our world isn’t going to be abruptly flipped upside down like a burger on a griddle. The Earth won’t be plunged into a three-day blackout. And contrary to what you’ve been hearing, Mayan astrologers never said any of that stuff would actually happen. The idea is so preposterous that a Web search for “Mayan Apocalypse” turns up as many spoofs as it does serious discussions.

The truth is a lot more prosaic than the tin-foil hat crowd would have you believe. Yes, the Mayans had what’s known as a long-count calendar, and yes, that calendar ends on Dec. 21 2012. But the delightful thing about calendars — including the Mayans’ — is that they always start over again from zero. Just because we have a record of the Mayan’s long-count equivalent of last year doesn’t mean they weren’t busy working on next year’s. As for Nibiru, well never mind. That one was borrowed from the ancient Sumerians, and the original prediction was that we’d get clobbered by the free-range planet in 2003. You might have noticed that that didn’t happen, so the date of arrival was moved up to 2012 to coincide with the Mayan silliness. An apocalyptic twofer!

(More: Safe Haven From the Mayan Apocalypse? Sorry, We’re Closed)

All the same, some folks at NASA are seriously worried — not about the Apocalypse itself, but about the real harm the talk of it may be doing to some peoples’ mental health. “I get a tremendous number of emails about it,” says David Morrison, a space scientist at the NASA Ames Research Center at Moffett Field, California who hosts the agency’s “Ask an Astrobiologist” website. “A large fraction are from people asking if the world will end, saying they’re scared and don’t know what to do. A few even talk about suicide.”

It might seem implausible that people would actually kill themselves over an imaginary cosmic event, but it happened back in 1997, when 39 members of the “Heaven’s Gate” cult in Southern California committed mass suicide under the delusion that the approach of Comet Hale-Bopp meant it was time to leave their physical bodies. Fearing that too many people were taking the 2012 scaremongering far too seriously, NASA convened an online Google+ hangout on Nov. 28 during which people could interact with six astronomers who were prepared to debunk any myth the public could throw at them. For nearly an hour, they did just that, patiently explaining, for example that any asteroid en route to obliterating Earth in just a few short weeks would have been spotted by telescopes long ago, and that Nibiru, one of whose leading proponents is a woman who insists she’s in touch with aliens from the Zeta Reticuli star system, would be the brightest object in the sky after the Sun and the Moon.

(More: Want to Tweet in Mayan? This Group Can Help)

But NASA has been debunking the Apocalypse for years now, in the same patient and rational manner, and it hasn’t really helped a whole lot. “I’m told that about ten percent of the public believes this stuff,” says Seth Shostak, a scientist with the SETI Institute in Mountain View, California, who wasn’t part of the online hangout. “That’s about the same percentage that believes in Santa Claus and thinks we never went to the Moon.”

Trying to reduce that percentage simply by providing facts isn’t necessarily going to work, however, since the proponents of nonsense are providing plenty of their own “facts” too. “I have to admit,” says Morrison, “that there’s something of an inherent contradiction when we scientists tell people not to trust things they read on the Internet, and then put information on the Internet.”

The real problem, said Andrew Fraknoi, an astronomer at Foothill College in Los Altos, California during the NASA webcast, “is that our schools have not taught skeptical thinking, have not taught children to distinguish between fantasy and reality. The real threat in 2012 is the public’s low level of science understanding.”

(More: Found: The Oldest Maya Calendar — and No, the World’s Still Not Ending)

Whether that could lead to panic or suicides this time around is unclear. Only a tiny handful of the thousands of worried e-mails Morrison has gotten raise the disturbing possibility of people taking their own lives and those have all been from adults.

But even if kids are not suicidal, plenty of them are very frightened, and have been for a long time. “Two years ago, I met with a group of middle school science teachers,” Morrison says, “and I asked them how many of them were dealing seeing kids who were worried about 2012. Nearly every hand shot up.” When December 21 comes and goes without incident, those fears should finally evaporate — that is, until the next Doomsday pronouncement comes along.

More: Mayan Apocalypse Film Festival — 21 Films For Our Final 21 Days

Article source: http://science.time.com/2012/12/12/nasa-versus-the-mayan-madness/

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What If the Curiosity rover finds life on Mars?

If all goes as planned, NASA’s Curiosity rover will touch down on Mars late Sunday night. Then, after a few weeks’ respite, it will begin probing the subsurface soils looking for organic molecules that could be the detritus of ancient Martian life.

A few billion years ago, vast oceans might have sloshed over the surface of the Red Planet, and a thick atmosphere probably enshrouded it. The liquids and gases have all but burned away by now, but any organisms Mars harbored in its ancient glory days would have left behind traces in the form of large, carbon-based molecules. “Organic molecules can last for billions of years,” explained Alexander Pavlov, a planetary scientist at NASA’s Goddard Space Flight Center.

Any simple organic matter Curiosity digs up could have biological origins, but it could also have been generated through more mundane chemical processes. However, if the rover detects complex organic structures — the kind we find in living things, and practically nowhere else but Earth — these would be “a very strong indicator” of ancient life on Mars, Pavlov told Life’s Little Mysteries.

As Seth Shostak, senior scientist at the SETI Institute, put it, “It would be like finding 2-ton blocks of limestone in the desert in Egypt and saying, hmm, these might be leftover pieces of a structure around here somewhere.”

‘Organic molecules can last for billions of years.’

- Planetary scientist Alexander Pavlov

Such a discovery would confirm for the first time that life has existed elsewhere in the universe. Big news, for sure — but what would life on Mars really mean for life here on Earth? 

ANALYSIS: 7 Theories on the Origin of Life

Ethnically Martian

If life exists on Mars, then we might be ethnic Martians ourselves, scientists told Life’s Little Mysteries. They explained that the small coincidence of having two life-bearing planets right next door to one another gets cleared up if one of the planets actually seeded life on the other — a concept called “panspermia.”

According to Pavlov, hundreds of thousands of Martian meteorites are strewn across Earth. These were hurled into space during past planetary collisions (such as the bash that left Mars with a crater covering nearly half its surface). One of these chunks of Mars could feasibly have contained spores that lay dormant during the interplanetary commute to Earth, and then blossomed upon arrival, some 3.8 billion years ago.

Alternatively, any Martian microbes we find could be ethnic Earthlings that made the trip from here to there. That’s a little less likely, considering the relative locations and gravitational pulls of the planets, the scientists said.

Either way, we can tell if Martians and Earthlings have a common root by determining whether Martian life encodes itself the same way we do — with DNA. DNA breaks down on hundred-thousand-year time scales, so we would need to find living or freshly dead alien microbes in order to be sure that Mars’ life arose independently of Earth’s.

Pavlov says it’s very possible that living things are eeking out an existence in Mars’ inhospitable modern landscape, if they were ever there in the first place. As attested to by the extremophiles inhabiting Earth’s underground volcanoes and frozen tundras, life tends to adapt and persist once it gets started. Following this line of thinking, if Curiosity finds remains of ancient life, NASA’s next Mars mission will go in search of extant microorganisms.

But if all the Martians we find are long dead, we might never know whether they were our cousins or not. It makes all the difference, in terms of understanding our place in the cosmos. If life arose just once, then the possibility remains that it could be exceedingly rare in the universe, Pavlov said. But if it arose twice in the same solar system, “then that would tell us that life is extremely common.” 

ARTICLE: If We Discover Aliens, What’s Our Protocol for Making Contact?

Not alone

As for how the discovery of Martian microbes would impact the average human, “we’ve done this experiment before,” Shostak said. In 1996, the headline on the front page of the New York Times exclaimed, “Clues in Meteorite Seem to Show Signs of Life on Mars Long Ago,” after NASA scientists incorrectly concluded that they had found microscopic fossils in a meteorite denoted ALH84001, which originated on Mars.

So, how did people react to the news?

“The public was very interested, but I can’t say there was a sudden outbreak of world peace, or people rioting in the streets,” Shostak said. “I don’t think it would change day-to-day behavior. The long-term consequences are a little less predictable, because it affects religious belief if Earth isn’t all that special.”

At the very least, alien life would resurrect the evolution versus creationism debate, said Jacob Haqq-Misra, a research scientist with the Blue Marble Space Institute of Science, a nonprofit research institute. If Martian microbes contain DNA, a telltale sign that they’re our ancestors, Christian fundamentalists’ sentiment that we’re far too special to have descended from monkeys might be repurposed toward denying the possibility of our descent from Martian microbes. “The philosophical and religious implications of microbial life are easy to ignore, because the discovery of microbes does not necessarily imply that human beings are any more or less rare,” said Haqq-Misra, an astrobiologist formerly at Penn State.

We’re not going to find intelligent, communicative beings on the Red Planet. So, ultimately, although Martian microbes have big implications for scientists and philosophers, Haqq-Misra said the rest of the world will sooner or later “lose interest.”

Copyright 2012 Life’s Little Mysteries, a TechMediaNetwork company. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

Article source: http://www.foxnews.com/scitech/2012/08/05/what-if-curiosity-rover-finds-life-on-mars/

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NASA Scientists gather in Santa Clara to ponder life beyond Earth

Click photo to enlarge

We may not be alone.

But our cosmic companions might be moist creatures in watery worlds — lacking, of course, E.T.’s impulse, or ability, to phone home.

The growing evidence of wet planets — and its implications in our search for extraterrestrial life — is among the marvels shared this weekend at a Santa Clara gathering of astronomers, astronauts and science fiction fans.

The theme of the three-day SETIcon event: the exploration of universe and the quest to find life beyond Earth.

Scientists agreed that the neighborhood is looking a lot friendlier.

What began as a trickle of new planet discoveries a decade ago has turned into a torrent — and not all places are rocky, gaseous or just plain weird.

Of the 3,000 or so candidate planets found so far by Kepler — a NASA mission designed to find Earth-size planets around other stars — several hundred of them share one special characteristic: a density of nearly 1 gram per cubic centimeter.

That’s the density of water.

And, it could be prime real estate, said longtime planet hunter Geoff Marcy of University of California-Berkeley, speculating that these planets are composed of 30 to 70 percent water. “They’re not pure rock,” he said. “They’re not pure gas. These are planets that are composed almost certainly of water.”

In the past year, there’s been much hullabaloo about the search for a so-called “Goldilocks” planet that is Earth-like in its orbit or

diameter.

But the prospect of water is equally profound, Marcy said.

That’s because water is the key solvent of biochemical reactions. In its rich cocktail of oxygen and hydrogen molecules, carbon can break apart and re-assemble into many forms. Maybe, for instance, amino acids. Or proteins. Or even DNA, the blueprint of life.

In this wet petri dish, perhaps exists a recipe for a creature that shares our passion for baseball, barbecue and bad television.

If planetary water is liquid — not ice or gas — “there is real hope that the planet out there will develop replicating molecules like DNA,” said Marcy.

Then what? “Those replicating molecules will compete for energy and resources,” he said. “And eventually that competition will lead to surviving molecules that outcompete others — and through Darwinian evolution, the development of a lipid-based cell membrane.”

“And voila!” he said. “The first signs of life.”

Predicted Seth Shostak, senior astronomer at the SETI Institute, sponsoring the event: “Waterworld didn’t turn out so well for Kevin Costner…But they may hold many more prospects of intelligent life.”

Planets are as common as a cheap hotel, scientists say. Here’s the math: If each star has an average of five planets — a reasonable guess, based on Kepler and other detection tools, scientists said — and our galaxy holds 200 billion stars, perhaps as many as a trillion planets are out there, awaiting discovery.

Even comedian Woody Allen once asserted: “There is no question that there is an unseen world. The problem is how is it from Midtown, and how late is it open?”

But here things get tricker.

Many of these newly-found planets are hostile places. Some circle too close to their star, and get blowtorched. Others circle too far away, so are very chilly places. A few don’t seem to circle at all, but have wacky, chaotic and tilted orbits. They yank at each other and are eventually flung out of their star system, as if from a slingshot, the scientists noted.

The most unlucky planets aren’t even connected to a star rather soar through space, untethered by gravity.

Still, even if just .01 percent of a trillion planets are wet and inviting, life might have a chance.

But what matters to SETI is not just life — but intelligent life. Or more specifically: life with tools.

In a wet world, techologies like phones, computers and rocketships are tough to construct, Marcy said. Even a very smart creature, surrounded by the entire periodic table, can’t do much with flippers and fins.

“You need metallurgy to develop electronics,” agreed Shostak.

And carting us light years into deep space to find them requires technology akin to wormhole rockets or matter-antimatter engines, the standard transports of science fiction, according to Shostak.

Meanwhile, there are other big efforts to unpack the composition of the universe.

UC-Berkeley astronmer Alex Filippenko and Bill Nye listed just a few remaining Big Questions:

  • How can we detect gravitational waves?

  • What gave rise to the universe — why was there a “Big Bang?”

  • Why, despite gravity, is the Big Bang accelerating, instead of slowing down?

  • Are there multiple universes?

  • What is dark matter, which accounts for one-quarter of our universe — and can we directly detect it?

  • What are the characteristics of dark energy, which accounts for almost three-quarters of the universe?

  • What triggers the spark of life?

    And, while we’re deep in thought: How does the brain work?

    “Discoveries are being made all the time,” said Filippenko. “But there’s a whole bunch more that is left to be discovered.”

    Mosaic staff writers Nashra Anwer and Andy Fang contributed to this report.

    Contact Lisa M. Krieger at 650-492-4098.

    FOR MORE INFORMATION

    SETIcon: http://seticon.com
    SETI Institute: www.SETI.org
    Sunday’s agenda runs from 9:30 a.m. to 5:15 p.m.

  • Article source: http://www.mercurynews.com/health/ci_20926451/nasa-scientists-gather-santa-clara-ponder-life-beyond

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    Prometheus Rests on Real Astronomy – Sci


    Hollywood has always loved the idea of alien invaders, but today’s sci-fi films — from Avatar to the [new movie] Prometheus, are increasingly science-based.

    Astronomers have discovered more than 700 worlds orbiting nearby stars in the past two decades, and the moviegoing public is just getting the message about the new planets, say astronomers such as Seth Shostak of the SETI Institute. So, in a way, pop culture is reflecting science, including efforts such as NASA’s Kepler space telescope, which is looking to find more planets in their stars’ “habitable zone,” warm enough for liquid oceans, like Earth’s, that may be able to support life forms.

    “I think the public has grasped the fact that planets out there are as common as cheap motels,” Shostak says, noting that our Milky Way galaxy alone contains 300 billion stars, including some with multiple planets. “If only one in 1,000 is in the habitable zone, that is still about a billion habitable planets in our galaxy,” he says.

    Planetary scientist Kevin Hand of NASA’s Jet Propulsion Laboratory in Pasadena, Calif., was a science adviser to Prometheus and offered advice to Avatar’s team. He says top filmmakers, such as James Cameron and Ridley Scott, are paying increasing attention to the plausibility of the alien worlds they create. Moviemakers have long imagined alien worlds, for example the double-sunned Tatooine of Star Wars, but the latest ones “really listen to where science is headed today,” Hand says.

    Through the U.S. National Academy of Sciences’ Science Entertainment Exchange program, which unites moviemakers with scientists, Hand was involved in technical discussions with the Prometheus team. “We needed a world to explore that would be habitable, but with a somewhat toxic atmosphere, which was an interesting exercise,” Hand says.

    The result was a world called LV-223, which has water, but its air is too poisoned to easily breathe. That’s easy to imagine, because some stars with planets have trace metals, indicating their chemistry might differ from ours, along with signs of water in the dust disks around the stars that might be a source for water on the planets. LV-223 is the moon of a giant planet, resembling the easier-to-detect ones most often discovered by astronomers so far. The movie’s background materials call it a “cold and implacable environment (that) is more like hell than heaven.”

    Without spoiling the movie for those who haven’t seen it, one idea central to the plot is the notion of aliens “seeding” life on Earth. (continued…)

     

    © 2012 USA TODAY under contract with YellowBrix. All rights reserved.



     

    Tim:

    Article source: http://www.sci-tech-today.com/story.xhtml?story_id=031001R3PFS9

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    Ridley Scott movie ‘Prometheus’ rests on some real astronomy

    Astronomers have discovered more than 700 worlds orbiting nearby stars in the last two decades, and the moviegoing public is just getting the message about the new planets, say astronomers such as Seth Shostak of the SETI Institute. So, in a way, pop culture is reflecting science, including efforts such as NASA‘s Kepler space telescope, which is looking to find more planets in their stars’ “habitable zone,” warm enough for liquid oceans like Earth’s that may be able to support life forms.

    “I think the public has grasped the fact that planets out there are as common as cheap motels,” Shostak says, noting that our Milky Way galaxy alone might contains 300 billion stars, including ones with multiple planets. “If only 1 in 1,000 is in the habitable zone, that is still about a billion habitable planets in our galaxy,” he says.

    Planetary scientist Kevin Hand of NASA’s Jet Propulsion Laboratory in Pasadena, Calif., was a science adviser to Prometheus, and also offered advice to Avatar‘s team. He says top filmmakers, such as James Cameron and Ridley Scott, are paying increasing attention to the plausibility of the alien worlds they create. Movie makers have long imagined alien worlds, for example the double-sunned Tatooine of Star Wars fame, but the latest ones, “really listen to where science is headed today,” Hand says.

    Through the U.S. National Academy of Sciences’ “Science Entertainment Exchange” program, which unites movie-makers with scientists, Hand was involved in technical discussions with the Prometheus team. “We needed a world to explore that would be habitable, but with a somewhat toxic atmosphere, which was an interesting exercise,” Hand says.

    The result was a world called LV-223, which has an ocean, but with air too poisoned to easily breathe. That’s easy to imagine, because some stars with planets have trace metals indicating their chemistry might differ from ours, along with signs of water in the dust disks around the stars that might be a source for water on the planets. LV-223 is the moon of a giant planet, one resembling the easier-to-detect ones most often discovered by astronomers so far. The movie’s background materials call it a “cold and implacable environment (which) is more like hell than heaven.”

    Without spoiling the movie for those who haven’t seen it, one idea central to the movie was the notion of aliens “seeding” life on Earth. “We talked about that a lot,” including the idea of “conducting experiments with microbes on other worlds and what happens when experiments go ‘wrong,’ ” Hand says. For similar reasons, NASA and Russia’s space agencies have carefully sterilized past missions to Mars, fearing just this kind of contamination.

    Although the filmmakers based their concept for the spaceship, called the Prometheus, on NASA and European Space Agency designs, space travel sending humans in hibernation across light years to visit an alien world seems unlikely by 2089, the time-frame for the film, Shostak says. Instead of the four years envisioned in the film, travel times to nearby stars for people would still span centuries because of the speed limit set by light, which tops out at 5.9 trillion miles in a year. That’s something the movie evades with invented human hibernation couches. The Defense Advanced Research Projects Agency’s “100 Year Starship Initiative,” however, is investigating technologies needed for interstellar travel.

    Alien biology remains a little shaky in films, Hand cautions. “Any species that has to reproduce by traveling 50 light years to invade the chest cavity of another alien species looks a little dicey from an evolutionary-survival standpoint,” he says.

    On the other hand, “I was inspired to go into science by some really bad science-fiction films from the 1950s,” Shostak says. “It can’t hurt to have some real science in the movies.”

    Article source: http://www.usatoday.com/tech/science/columnist/vergano/story/2012-06-09/prometheus-science/55476010/1

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    Science Versus Fiction: SETI’s Seth Shostak on Battleship

    An alien ships rises from the sea in Battleship.
    Photo: ILM/Universal Pictures

    Within the first five minutes of Battleship, we learn that contact has been made with Planet G, a rocky planet that actually exists in the constellation Libra.

    In real life, scientists have labeled the planet in the Gliese 581 system a “Goldilocks zone,” meaning that its Earth-like properties could potentially support life. True to Hollywood form, notorious extraterrestrials from Planet G — resembling Halo‘s Master Chief more than Alien’‘s xenomorphs — are hell-bent on destroying our blue planet.

    Seth Shostak of the Search for Extraterrestrial Intelligence says the grain of scientific truth in Hasbro’s $200 million popcorn blockbuster might be enough to generate real interest in astronomy.

    “People don’t learn science in movies,” said Shostak, who served as a scientific consultant on the PG-13 Battleship, which opens Friday in the United States. “You don’t go to the movies thinking, ‘I hope I learn some quantum mechanics this afternoon.’ But on the other hand, movies are instrumental and influential in getting young people interested in science.”

    Shostak is no stranger to the intersection of science and Hollywood. He’s consulted on a number of productions — from Contact to Species II to the remake of The Day the Earth Stood Still — in part due to The Science Entertainment Exchange, a private institution dating back to 1863, when Abraham Lincoln signed a charter by Congress to provide scientific advice to the United States.

    The SETI senior astronomer was once one of those young people drawn to science by sci-fi movies and creature features. “When I was a kid, which was just after Edison invented moving pictures,” he joked in a phone interview with Wired, “there were films that involved aliens coming to Earth for bad purposes.” He cites the original The War of the Worlds and The Day the Earth Stood Still as being what Battleship could be for kids (and some adults) today.

    Shostak’s background — he studied astronomy and researched galaxies at the California Institute of Technology, and harbored a love of cheesy science fiction films — made SETI a perfect fit when he started working for the agency in 1990. “I already knew a lot about the techniques,” he said.

    Science Versus Fiction in Battleship

    SETI and The Beacon Project: SETI uses radio astronomy to listen for transmissions from space. In Battleship, The Beacon Project is a satellite communication device that started sending waves — it’s not explained what kind, but they look like awesome lasers — toward the Gliese 581 system in 2005 in a search for extraterrestrial life.

    Fast-forward to today, and alien spaceships are descending from the sky above Earth, confirming what Stephen Hawking warned us all about — a hostile alien race making contact. In this case, that contact involves gargantuan explosions and high-tech weaponry. Perhaps most importantly, it includes a self-aware chainsaw on wheels that eats its way through anything in its path.

    Alien reaction times: The movie describes a “slingshot effect” that hurls the transmission toward the Gliese 581 solar system at a very high speed, but the time frame from when the aliens receive our transmission to when they invade is highly unlikely. Spaceships traveling at the speed of light would take 20 years to get to Earth because the planet is 118 trillion miles away.

    Still, we should probably cut Battleship some slack: One of the most beloved aliens of all time made an even bigger intergalactic-travel faux pas, according to Shostak.

    E.T. was far-fetched,” Shostak said. “E.T. was this wimpy-looking kid that came to Earth to pick some plants, but he came from the Andromeda Galaxy to do that.” The Andromeda Galaxy is well over 2 million light-years away, which gives Battleship a one-up on silly believability.

    Searching for Goldilocks: SETI will make more of an effort to target specific Goldilocks planets within the next couple of years, mirroring The Beacon Project in certain ways.

    “When I started, we assumed stars had planets, but we didn’t know,” Shostak said. “In fact, our current SETI program is directed at star systems that are known to have planets thanks to the NASA Kepler telescope.”

    Governmental responses: During Shostak’s days at SETI, he’s experienced some false alarms when it comes to aliens, but the organization has come up with a protocol for dealing with the situation (he chairs a committee charged with redrafting the “appropriate” response).

    “You check out the signal first to make sure it’s for real,” he said, “and then you notify the astronomical community, of course, because you want other people to check it out for you. And then you notify the public and the media and the government.”

    Unlike the movie, you surely don’t send out a signal until you consult the United Nations. And contrary to conspiracy theory, Shostak says the government probably won’t do anything at first. “No Men in Black show up,” he said. “It’s the media that starts to call you right away.”

    What aliens want: Sci-fi books and movies have outlined dozens of reasons why aliens would come to Earth, but Shostak said the most obvious examples are stupid. Searching for water? “It doesn’t make sense, because hydrogen is the most commonplace element in the universe,” he said. “There’s going to be a lot of hydrogen and a lot of oxygen in the universe, which means there’s going to be a lot of H2O.”

    What about aliens probing humans to create hybrids? “If you want to believe that, look, 80 percent of a pumpkin’s DNA is identical to human DNA,” he said. “And yet, I don’t worry too much about pumpkin DNA getting inside me except around Thanksgiving when I eat it as a pie.”

    So, why would an alien race make contact with humans? After all, if an alien civilization is advanced enough to travel throughout the cosmos, it wouldn’t be after us for our knowledge of physics and astronomy. “That’s like Chris Columbus sailing to America because he wants to learn about building wooden ships,” Shostak said.

    For him, it’s simple: The only reason extraterrestrials would want to come to Earth would be to check out our unique cultures. But again, why us? Wouldn’t we be too primitive to be of any interest?

    “That’s speculation on alien sociology,” Shostak said. “Charles Darwin sailed around the world for two years on the Beagle and he had quite a bit of interest in things like the iguanas of the Galapagos, even though they were primitive compared to your average Englishman.”

    Article source: http://www.wired.com/underwire/2012/05/battleship-science/

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    When Aliens Attack: ‘Battleship’ Strategy with SETI Astronomer Seth Shostak

    Seth Shostak, a senior astronomer at the SETI Institute, talks all things “Battleship.”

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    Good News, Alien Seekers: ET Probably Doesn’t Need a Freaky-Big Moon Like Ours

    Seth Shostak is Senior Astronomer at the SETI Institute in California, and the host of the weekly radio show and podcast, “Big Picture Science.”

    The Moon is a ball of left-over debris from a cosmic collision that took place more than four billion years ago. A Mars-sized asteroid—one of the countless planetesimals that were frantically churning our solar system into existence—hit the infant Earth, bequeathing it a very large, natural satellite.

    OK, that’s a bit of modestly engaging astrophysics. But some scientists think there’s a biological angle here. Namely, that elaborate terrestrial life might never have appeared if that asteroid had arrived a few hours earlier, and sailed silently by. Put another way, if every night were moonless, you wouldn’t be around to notice the lack of a moon.

    But is that true? Did our cratered companion really make our existence possible?

    Well, there’s no doubt that the Moon is more than a handy night light and a hair restorer for werewolves. It’s responsible for the substantial amplitude of earthly ocean tides. These are of obvious influence if you’re a geoduck, a type of clam that people dig up at low tide. But even if the Moon didn’t exist—even if it had been vaporized billions of years ago by cantankerous Klingons—there would still be (somewhat lower) tides raised by the Sun. For creatures dependent on the oceans’ ebb and flow, life could go on.

    However, the Moon does something else that might be of greater significance: It stabilizes the Earth’s spin. In other words, it keeps the rotation axis tilted at roughly the same angle relative to the plane of our orbit around the Sun. This tilt is about 23 degrees, a fact once known by school kids. If the Earth were in deep, deep space, the tilt—which is called “obliquity” by cognoscenti—would never vary.

    But our world has neighbors; in particular, the Sun and the other planets of the solar system. Because the Earth is not a perfect sphere (it bulges a bit at the equator, much like most men over 40), these neighbors torque our world with their gravitational pull, causing our spin axis to change. The strongest effect is due to the Sun. But our path around the Sun is endlessly repetitive. So while Sol will change the direction of our planet’s spin, it doesn’t change the tilt angle.

    On the other hand, the arrangement of the planets relative to Earth doesn’t repeat. Consequently, the effect of their torques can build up, and lead to a dramatic “tipping over” of our planet. The unpleasant consequence would be climate havoc.

    Enter the Moon. It’s not as big as the planets, but it’s a heck of a lot closer, so its effect on the Earth really counts. Over the course of a month, it pulls first one way, and then the other. And since this cycle occurs over and over, it serves to overwhelm the long-term chaos that the planets would otherwise wreak. The Moon stabilizes Earth’s obliquity.

    Well, almost. The tilt actually varies between 22 and 24.5 degrees—and the variation is enough to induce such environmental inconveniences as the occasional ice age. Without the Moon, it might be much worse. Consider Mars, whose own moons are puny. The Red Planet suffers swings in tilt that range from 11 to 45 degrees.

    A moonless Earth, some scientists say, would have polar caps wandering like feral cats—greatly, perhaps fatally, inhibiting the evolution of complex life.

    OK, but so what? After all, we do have the Moon. Yes, but our moon is an accident, a fairly improbable one. Of the habitable planets around other stars—planets that are similar in size, composition and temperature to Earth—few will boast a natural satellite similar to our moon. Therefore, if a large moon is really crucial for big-time biology, we shouldn’t expect a lot of sophisticated cosmic company. A dozen years ago, the popular book Rare Earth listed a big moon as one of the very special features of our planet, and one essential to the evolution of intelligent beings.

    However, some recent work by NASA scientist Jack Lissauer and his colleagues paints a more propitious picture. They’ve run computer simulations of Earth’s spin to see how it would behave if there were no Moon. The simulations were done hundreds of times, because the various gravitational effects—with small torques building over time—cause the system to be chaotic. A slightly different initial arrangement of planets, or tiny perturbations, such as a small meteor hitting the Earth, could change the situation significantly millions of years down the road. This is somewhat like the proverbial butterfly whose flapping wings eventually cause thunderstorms on the other side of the globe.

    The simulations were a big undertaking, but the results are in: Without our moon, we would, indeed, suffer larger swings in Earth’s tilt. But here’s the good news: Even over the course of hundreds of millions of years, these swings are not fast and traumatic. Lissauer’s team reckons that the tilt of a moonless Earth would be stable enough, for long enough, to allow complex life to gain a claw-hold, or at least to adapt to new environmental circumstances when the poles moved.

    Bottom line? Those who search for life in space can take heart. For an Earth-like planet, a large moon is helpful, but not essential. Unless, of course, you’re a werewolf.

    Image: Shutterstock

     






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    Article source: http://blogs.discovermagazine.com/crux/2012/01/24/good-news-alien-seekers-e-t-probably-doesnt-need-a-freaky-big-moon-like-ours/

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    Bidwell Park observatory turns 10

    CHICO The 10th anniversary of the
    Kiwanis Chico Community Observatory in Bidwell
    Park was celebrated Nov. 18-19 with an
    astronomy film festival and fundraiser.

    Six documentaries were shown over the two
    days during the Starlight Film Festival in Sierra
    Nevada Brewing Co.’s Big Room.

    Astronomers and filmmakers spoke.

    Funds raised during the event will help with
    the observatory’s maintenance. The observatory,
    located next to Horseshoe Lake, was built
    with the help of Chico Kiwanis Club, and is
    now operated by the nonprofit Pacific Center
    for Astronomical Outreach Inc.

    Since its opening, more than 100,000 individuals
    have enjoyed the free use of the facility,
    according to founders.

    For the film festival, five Public Broadcasting
    System documentaries were shown over the
    two days: “Hubble’s Amazing Rescue,” “Telescope:
    Hunting the Edge of Space,” “Seeing in
    the Dark,” “Journey to Palomar,” and “400
    Years of the Telescope.”

    The latter is the locally produced documentary
    by Kris Koenig and Anita Ingrao of Chico.
    PBS just released the five films in a DVD
    collection titled “Stargazing.”.

    Steven Beckwith, vice president of research
    at University of California and past director of
    Hubble Space Telescope Science Institution,
    and Seth Shostak, senior astronomer at Search
    for Extraterrestrial Intelligence Institute, spoke
    about current astronomical research.

    The film “Black Sky,” which follows

    Burt
    Rutan’s quest to win the Ansari X prize as the
    first commercial space flight, was presented,
    followed by a program by Brian Binnie, Space-
    ShipOne astronaut, the first commercial astronaut
    that flew the winning flight.

    Article source: http://www.redbluffdailynews.com/news/ci_19411135

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    we should search for life in DC that would be a real find

    John Zarrella’s series “Search for Life” premieres this week on CNN.

    The Kepler telescope finds a planet circling two suns, right out of “Star Wars.” Data from the Galileo mission suggest that a body of liquid water the size of the Great Lakes is on Jupiter’s moon Europa. The Mars Reconnaissance Orbiter finds sand dunes rippling across the planet’s surface.

    Every day, NASA pours out press releases with fascinating, sometimes groundbreaking revelations. The problem is, much of it flies under the radar, getting absorbed, minimalized and shoved aside in the noise of events around the world. Unless you are addicted to Light Years (and I hope you are), you could easily miss this wonderful dessert NASA keeps serving up, a heavenly hash of sorts.

    As I watched all of this “stuff” pouring into my e-mail, it seemed to me that there was a series of stories that needed telling. The common thread is just how wondrous the universe is and how, when you consider all that’s out there, it’s hard for me to imagine we’re all alone.

    It just so happened there was a very nice peg for a series: This week, NASA is planning to launch the most sophisticated rover it has ever sent to Mars. The rover named Curiosity is capable of detecting organic material required for life as we know it. For the first time, NASA is going to Mars with its primary focus on finding evidence of life.

    “This mission is a key step in answering the eventual question whether life ever existed on Mars,” NASA Deputy Project Scientist Ashwin Vasavada said.

    Vasavada says that finding organic material is a long shot, but Curiosity is going to the place scientists believe gives them the best chance to find it. It’s called Gale Crater. Scientists think that if water ever flowed on Mars, it might have pooled up in this crater. And where there’s water, there could be life.

    Given that NASA is about to embark on this incredible high-risk, high-reward mission, I thought it would be just plain fun to take a look at how the “search for life� is going.

    We decided to look at all the planets being discovered by the Kepler telescope team. And then there’s the Webb telescope, with its promise and its problems. It’s years delayed and billions of dollars over budget but could revolutionize our understanding of the universe. And then we thought, you know what, we’re doing all these great things to find life; what about protecting the life we have here from asteroids?

    As we talked with the scientists, it became increasingly clear that most of them are convinced there’s other life out there. Seth Shostak, an astronomer with the SETI (Search for Extraterrestrial Intelligence) Institute, says it’s turning out that planets are “like kittens�: You don’t just get one in the litter.

    “So the bottom line is, there are about 100 thousand billion billion planets just in the part of the universe we can see. That’s a very large number. Kind of hard to imagine that they’re all sterile, too,� Shostak said.

    The Kepler folks are a bit more guarded, saying they have their opinions, but their focus is on finding planets of similar size to Earth. Not just close in size but also just the right distance from their sun to perhaps support life. Scientists refer to this as the “Goldilocks zone.�

    “Kepler is just the first step,â€� Principal Investigator Bill Borucki said. “It says, ‘here are Earth-sized planets. Here’s how many there are. And here are which number of them are in the habitable zone.’ â€�

    The Kepler science team is making new discoveries of planet candidates, it seems, every day. They call them candidates until they are verified. They’ve found more than 1,200, including about 50 in that habitable zone.

    “From our consoles, from our computers, we are exploring the universe. We are literally finding new worlds just like the European navigators did when they crossed the Atlantic 500 years ago,� Project Scientist Natalie Batalha said.

    Even the planets they’re finding not like other Earths are bizarre. There’s one at least twice the size of Jupiter and another with the density of Styrofoam. “No one,� Borucki said, “expected that.�

    The bottom line is, as astrophysicist Jonathan McDowell told me, “We’re just going through this amazing period where all the different new tools we’re bringing to bear both with ground-based telescopes and space telescopes just give us these gobsmacking revelations about what’s going on.�

    So what it comes down to is this: While there may be other life out there, the reality is that the universe is such a big place, we’re not going for a visit to our celestial neighbors anytime soon. Consider it this way: Kepler is finding planets in our Milky Way galaxy, our own backyard. But they are still so far away, it could be 50 or perhaps 100 years before we have telescopes capable enough to actually see exactly what they look like.

    As for life out there, even if we never find it, the universe is so big, could we ever really say we know we’re alone?

    Article source: http://lightyears.blogs.cnn.com/2011/11/22/behind-the-scenes-of-the-search-for-life/?hpt=hp_t3

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