The cosmos has been expanding since the Big Bang, but how fast? The answer could reveal whether everything we thought we knew about physics is wrong.

The Big Bang Theory is a popular sitcom that has kept us entertained with its quirky characters and scientific humor ...

The limit of our vision extends more than 46 billion light years in all directions. But how big was the Universe when it was first born?

If we know how big the observable Universe is, why can't we figure out how big the unobservable part is?

How big is the universe? Could it be infinitely large? If the universe has an edge, what is beyond the edge? And if the universe had a beginning, what was going on before that? Our experience of ...

The universe is a big place, but do we really know how big? Scientists think they do, and use an array of methods to figure it out. Here are our CliffNotes.

From cosmic road trip analogies to mind-bending measurement of the universe, here's a closer examination of just how gigantic our universe really is.

The team explores one of the greatest discoveries of modern astronomy - that our universe is expanding - and the new ...

A big Hubble constant also means a young universe: if the cosmos is expanding quickly, it has gotten to its present size quickly, and the Big Bang is relatively recent. A Hubble constant of 100 ...

A study published this week in an astronomical journal suggests our universe could be 26.7 billion years old, or about twice as old as we thought.

How big is the universe? Long considered one of the most perplexing questions, it's on the minds of many astronomers these days. Some even think they can answer it. In this media-rich essay Brent ...