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“One of the big scientific questions is how did life get started and how did it spread through the universe,” says Jay Melosh, distinguished professor of earth and atmospheric sciences at Purdue University.
Straight from the Source
“That question used to be limited to just the Earth, but we now know in our solar system there is a lot of exchange that takes place, and it’s quite possible life started on Mars and came to Earth. There’s also been a great deal of discussion about the possible spread of life in the universe from star to star.”
Moon rocks and Mars meteorites have been found on Earth, which led Melosh to previously suggest living microbes could be exchanged among planets in a similar manner.
In contrast to our own solar system, the exchange of living microbes between super-Earth and other planets in the Gliese 581 solar system is unlikely, Melosh says.
Laci Brock, a student studying interdisciplinary physics and planetary science, and Melosh presented their findings this week at the 43rd Lunar and Planetary Science Conference.
Brock examined the Gliese 581 planetary system because Planet d, known as super-Earth, falls in a “habitable zone” where liquid water could possibly exist.
“Laci has found the somewhat surprising result that it is very difficult for materials to spread throughout that system in the same way it could take place in our solar system,” Melosh says.
All four planets found in Gliese 581 are within close proximity to their central star, which results in large orbital velocities, Brock says. However, the initial velocity of material leaving Planet d is not enough to allow exchanges among planets.
“Planet d would have a very small chance of transferring material to the other planets in the Gliese system and, thus, is far more isolated, biologically, than the inner planets of our own solar system,” Brock says. “It really shows us how unique our solar system is.”
A more extended solar system would be needed for exchange of materials among planets, Melosh says. “None of the solar systems that have been found so far would have opportunities for exchange of life among the different planets like what our own solar system offers.”
The Opik-Arnold method was used to simulate 10,000 particles being ejected from Planet e and super-Earth. The velocity ranges of the particles were scaled from each of the planet’s orbital velocities, which is very high by solar system standards due to the close proximity to their central star, Brock says.
“Ejections from Planet d have a low probability of impact on any other planet than itself, and most ejected particles would enter an initial hyperbolic orbit and be ejected from the planetary system.”
More news from Purdue University: http://www.purdue.edu/newsroom/
Article source: http://www.futurity.org/science-technology/super-earth-life-sticks-close-to-home/
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