Found: An Earthlike Planet at Last
The planet is only about three or four times as massive as our home world, meaning it probably has a solid surface just like Earth. Much more important, it sits smack in the middle of the so-called habitable zone, orbiting at just the right distance from the star to let water remain liquid rather than freezing solid or boiling away. As far as we know, that's a minimum requirement for the presence of life. For thousands of years, philosophers and scientists have wondered whether other Earths existed out in the cosmos. And since the first, very un-Eearthlike extrasolar planet was discovered in 1995, astronomers have been inching closer to answering that question. Now, they've evidently succeeded (although to be clear, there's no way at this point to determine whether there actually is life on the new planet).Remember the day, and the name: 29 September, 2010 - Gliese 581g.
Does this mean aliens from Gliese 581g are visiting Earth? Of course not. But it does point out, yet again, why the extraterrestrial hypothesis for the UFO phenomenon, of all the "paranormal" hypotheses on offer, makes the most sense - by far.