Life on Alien Planets May Not Require a Large Moon After All
By PAUL SCOTT ANDERSON - UNIVERSE TODAY
Added: Thu, 01 Dec 2011 13:21:52 UTC
Earth and Moon. Credit: NASA
Ever since a study conducted back in 1993, it has been proposed that in order for a planet to support more complex life, it would be most advantageous for that planet to have a large moon orbiting it, much like the Earth’s moon. Our moon helps to stabilize the Earth’s rotational axis against perturbations caused by the gravitational influence of Jupiter. Without that stabilizing force, there would be huge climate fluctuations caused by the tilt of Earth’s axis swinging between about 0 and 85 degrees.
But now that belief is being called into question thanks to newer research, which may mean that the number of planets capable of supporting complex life could be even higher than previously thought.
Since planets with relatively large moons are thought to be fairly rare, that would mean most terrestrial-type planets like Earth would have either smaller moons or no moons at all, limiting their potential to support life. But if the new research results are right, the dependence on a large moon might not be as important after all. “There could be a lot more habitable worlds out there,” according to Jack Lissauer of NASA’s Ames Research Center in Moffett Field, California, who leads the research team.
Dave Mosher - National Geographic Comments
The sun is the roundest natural object ever precisely measured, astronomers say.
Liat Clark - Wired.co.uk Comments
Astrophysicists simulate 14 billion years of cosmic evolution in high resolution
Lawrence Krauss - CNN Comments
Author and theoretical physicist Lawrence Krauss, discusses what it would be like if we found life on another planet.
Sean Carroll - Cosmic Variance -... Comments
Launched on November 26, 2011, the mission is scheduled to land on Mars’s Gale Crater tonight/tomorrow morning: 5:31 UTC, which translates to 1:30 a.m. Eastern time or 10:20 p.m. Pacific.