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

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.

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.

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.

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

Astronomers at Johns Hopkins University designed an interactive map of the universe that illustrates 200,000 galaxies, which stretch from our own to the very edge of the observable universe.

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

To someone born in the far distant future, the Universe's memory of where it came from -- of the Big Bang, of other galaxies, and of the process that brought all of this into existence -- will be ...

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

The universe is expanding. But how fast? Why is this happening? And what will be the universe’s ultimate fate? These are big, literally cosmic questions, and astronomers continue to struggle to ...

Later the term Dark Energy was coined for the force that drives the accelerated expansion. The Echo of the Big Bang How do we tell how far away other stars are anyway?