Ralph Asher Alpher (February 3, 1921 August 12, 2007) was an American cosmologist.

It's not one of the first things people would say, if you asked a modern cosmologist, What are the problems we're trying to address?

Carl Edward Sagan ( November 9, 1934 December 20, 1996) was an American astronomer, cosmologist, astrophysicist, astrobiologist, author, science popularizer, and science communicator in astronomy and other natural sciences.

John Cromwell Mather (born August 7, 1946, Roanoke, Virginia) is an American astrophysicist, cosmologist and Nobel Prize in Physics laureate for his work on the Cosmic Background Explorer Satellite (COBE) with George Smoot.

In 1995, the cosmologist Carl Sagan expressed concern about the trend toward a society in which, clutching our crystals and religiously consulting our horoscopes, our critical faculties in steep decline we slide, almost without noticing, into superstition and darkness.

I wrote my book, Our Final Century, as a scientist, just a general scientist. But there's one respect, I think, in which being a cosmologist offered a special perspective, and that's that it offers an awareness of the immense future.

At TEDxCaltech, cosmologist Sean Carroll attacks in an entertaining and thought provoking tour through the nature of time and the universe a deceptively simple question Why does time exist at all? The potential answers point to a surprising view of the nature of the universe, and our place in it.