Oct 31, 2012 — NASA's Kepler Mission has been spotting many "Earth-like" planets within our galactic neighborhood. But what fraction of these Earth-like planets are really like our planet? The more we learn about Earth's remarkable properties, the rarer our planet seems to be. And with it, the life it hosts.
Nov 8, 2011 — There's also "no credible information to suggest that any evidence is being hidden from the public's eye," the administration says. It was responding to an online petition asking that the government disclose any evidence of extraterrestrials.