Carl Sagan
Are we alone? If not, why hasn’t anyone dropped by Earth for a visit?
Scientists disagree on the probability that advanced extraterrestrials exist somewhere in the universe. Among the biggest arguments against aliens is ...
40th anniversary of NASA’s Project Viking and beginning of search for Martian life
40 years ago, Project Viking first landed on Mars. NASA would conclude that the project found no evidence of life ...
A rabbi and an alien walk into a bar: What happens when religious leaders meet extraterrestrials?
The search for extraterrestrial intelligence (SETI) presents a challenge for the major religions, who might find themselves threatened if alien ...
Tampering with nature is how humans can avoid extinction
Technology causes problems and yes we've been irresponsible to the very environment that keeps us alive. But it can also ...