The Universe may be only 13.8 billion years old, but the farthest galaxy is more than 13.8 billion light years away.

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.

Among them is a more precise measurement of the Hubble constant, which captures how fast our universe is expanding. Ever since the Big Bang, everything in the universe has been spreading apart.

That cosmologists cannot agree on one of the most elementary facts about the universe is striking enough. But that ...

Most scientists think that everything that we know and experience began with the Big Bang, 14 billion years ago. But how can ...

Back to Article List How fast is the universe expanding? Astronomers independently confirm a value for the Hubble constant, a number that reveals the universe's size, age, and eventual fate.

But when it comes to the question of how fast our universe is expanding, some new cosmological measurements are making us ever more confused.