Carl Sagan was one of the most influential scientific thinkers of the 20th century, not only for his research but for his unmatched ability to communicate complex concepts to the public. Born on ...

Yesterday I mentioned Carl Sagan and Cosmos to one of my summer research interns. "Who is Carl Sagan?" he asked. "You know, billions and billions of stars...," I implored. [Yes, I know he apparently ...

No one has ever explained space, in all its bewildering glory, as well as Sagan did. He’s been gone now for nearly two decades, but people old enough to remember him will easily be able to summon his ...