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 Big Bang taught us how the Universe as-we-know-it began. It taught us how the Universe grew up from this ultra-dense early state all the way up to the present day.

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 ...

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.

What’s more likely - that the universe will expand forever, or that it will contract in a big crunch, causing the end of the cosmos? – Mushahid, aged 16, Chitral, Pakistan.

Curious Kids is a series for children of all ages. If you have a question you’d like an expert to answer, send it to curiouskidsus@theconversation.com. How can a Big Bang have been the start of ...

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? 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 ...

How Big is the Universe? Two great debates have taken center stage in the search to answer this age-old question.

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 ...