Mathematical evidence indicates that our universe is flat, but it could be infinitely big, as well. You can figure out if an ...

The standard model of cosmology may be the best explanation we've got for why the universe is the way it is and how it all ...

Taken together, this presents us with a perplexing riddle about the nature of the cosmos itself: How can the universe get so mind-bogglingly big in such a short amount of time? There are two ways to ...

Sometimes even being in a big city can be enough to make you feel small. But looking up into the empty vastness of space, the sheer size of the universe is almost impossible to comprehend.

An almost uniform plasma of electrons and hydrogen and helium ions filled the entire Universe, all bathed in a brilliant glow of light-the blaze of the big bang itself. At this early stage ...

For the next millennium or so, few expected the entire universe to have an age ... The CMB let cosmologists get a sense of how big the universe was at an early point in time, which helped them ...

If we follow general relativity to its ultimate conclusion, then at a finite time in the past our entire universe was crammed into a single, infinitely dense point. This is known as the Big Bang ...

But it was also possible the nebulae might just be small clouds inside a Milky Way that made up the entire universe. Either way, the question remained: Where are we in the Milky Way? What position ...