The universe's vastness challenges human comprehension. It contains trillions of galaxies and countless stars. Pluto's ...

though most astrophysicists believe it started with the Big Bang. We know that we live in an expanding universe. That means the entire universe is getting bigger with every passing day.

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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 ...

Some 13.8 billion years ago, our universe was born in the Big Bang, and it’s been expanding ... even the existence of our entire species registers as but a brief ray of sunlight before an ...

There is a set of very special numbers, known as the fundamental constants of nature, that cannot be explained. Where do they ...

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 ...

It may be changing. Either scenario has big implications for how the entire universe ends. If dark energy is a constant cosmic acceleration, that means that the universe will die by what ...

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 ...

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 ...

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 ...