One of the most remarkable facts about our Universe is that it hasn't been around forever. The clumps and clusters of matter we see — planets, stars, gas clouds, galaxies and more — grew out of ...

Albert Einstein stands next to Catholic priest Georges Lemaître in a black and white photo from 1900 In 1915, Albert Einstein published his theory of general relativity, which originally stated that ...

There are a few fundamental facts about the Universe — its origin, its history, and what it is today — that are awfully hard to wrap your head around. One of them is the Big Bang, or the idea that the ...