Carl Sagan, the astronomer ... True to form, he discusses arcane aspects of the field—from how you define time to what it might look like inside a wormhole—with flair and a refreshing dash ...

Carl Sagan had a bone-chilling prediction about America in 1995. A passage from his book, The Demon-Haunted World, is now trending online a day after Donald Trump’s presidential inauguration.

Carl Sagan spent his childhood immersed in Mars ... “Whatever the reason you’re on Mars is, I’m glad you’re there. And I wish I was with you.” ...

NOVA: Could you please comment on the part of the quality of the evidence that is put forward by these so-called "abduction proponents." SAGAN: Well, it's almost entirely anecdote. Someone says ...

Dr. Sagan, a planetary scientist who was recognized for both his ingenious scientific ideas as well as his enormous influence in popularizing space science, was a new member of the SETI Institute’s ...

The famed astrophysicist Carl Sagan and former President Jimmy Carter ... That’s us. On it everyone you love, everyone you know, everyone you ever heard of, every human being who ever was ...