The big question: Did they leave artifacts behind for us to find?
He started writing it just weeks after Britain entered WWII.
"We really do know that pretty much every star in the sky hosts at least one planet," says astronomer Adam Frank.
Don't hold your breath, but oxygen may not be as essential to biological life as we once thought. A pair of new papers are
Columbia University astronomers say their laser plan would work, but others aren't so sure.
It will be able to detect and receive signals from outer space and help search for extraterrestrial intelligence.
"Life could spread from host star to host star in a pattern similar to the outbreak of an epidemic."
Just last month astrophysicist Stephen Hawking announced that he was supporting a $100 million program to investigate extraterrestrial
With this discovery, we come ever closer to the idea that life is common in the universe. Perhaps you are not convinced. That is OK; let me speculate what would happen should we ever find evidence of life beyond earth even if you think such discovery unlikely.