If the Universe is 13.8 billion years old, and the speed of light is truly our cosmic speed limit, how far away should we be able to see? The answer seems obvious: 13.8 billion light-years, since ...

Our cosmos is 13.7 billion years old and it all started with the Big Bang. When we look for really distant objects, we can’t really see the Big Bang because the universe was so hot and dense ...

If the Universe had no dark energy in it at all, the farthest objects — stars, galaxies, the leftover glow from the Big Bang, etc. — would be limited to 41.4 billion light years.

Some stars in the universe grow to 300 times larger our own sun. But how do they get so big, and how do they sustain their ...

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

The cosmic distance ladder is the world’s longest ruler, built to measure the universe. Since the time of the ancient Greeks, scientists have been constructing a cosmic measuring tape to measure ...

Observations that estimate how old the universe is, using cosmological parameters, push the timeline back to 13.77 billion years.

How can the universe be 95 billion light years across when it has only been in existence for approx 14.3 billion years? If nothing can travel faster than the speed of light shouldn't the universe ...

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.

But because light can only go so fast, we can only see the part of the universe whose light has reached us in the 14 billion years of the universe’s existence.

The universe is a big place, and it's filled with lots of shiny things, but how much light is there in that vastness of space? Paul Sutter explains where the light is coming from, and the biggest ...