But looking at our own Sun, a G-type star on its main sequence ... 4.0 to 4.5 aeons ago global temperatures were about 2,63OK," Carl Sagan and George Mullen wrote, turning their attention to ...

Carl Sagan had a bone-chilling prediction about America in 1995. A passage from his book, The Demon-Haunted World, is now ...

Carl Sagan researched the possibility of extraterrestrial life – life on other planets – and has become known for his snappy quotes that astronomers find inspiration from to this day.

Over the last century, our understanding of the evolution of stars has improved dramatically. By studying the cosmos, we have gained a pretty good theoretical model of how stars change over their ...