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.

Why is the observable universe so big? Here's why the universe’s size isn’t constrained by the speed of light.

The universe is undoubtedly a big place. But just how big is it? "That may be something that we actually never know," Sarah Gallagher, an astrophysicist at Western University in Ontario, Canada ...

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?

Up until now, everything that's outside the observable universe is beyond scientific measurement. The observable universe has a diameter of approximately 93 billion light-years.

The universe is vast, beyond what we can truly comprehend. But how big is it, really? In this video, we explore the incredible size of the universe, from its observable limits to the theories that ...

How big is the universe? Based on what we can observe, the universe appears to be almost 28 billion light-years across. However, it is far larger than that.

With all of the commotion and intrigue surrounding the New Horizons spacecraft approaching Pluto, the BBC recently highlighted an incredible interactive piece they put together … ...

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.

Dark energy means that the Universe's expansion is accelerating. But how big will it get, and how fast?

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

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 ...