When you look up at a clear night sky, you see space: a vast, seemingly infinite expanse that contains everything humans know to exist. To find out what lies beyond, a good place to start is to figure out where the universe ends. The problem is, scientists don’t know where space ends or if it ends at all.
The observable universe
The furthest humans can see out into space, using all the technology currently available to us, is 46 billion light-years (a light-year is the distance that light can travel in one year, and is equal to about 9.5 million kilometres). The volume of space that humans can see is called the observable universe. We don’t know what is out there beyond this. Perhaps it’s more galaxies and stars and space. Perhaps it’s the edge of the universe. Some think that the universe is infinite, meaning space goes on forever in every direction. In this case, there is nothing after space, because space is everything.
Life on the edge
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Camera Obscura
Imagine stepping inside a dark room, where the only source of light comes through one small hole in the wall.
MANCHESTER SCIENCE FESTIVAL
From 18-27 October, shoppers at the Arndale shopping centre in Manchester, England, will face a giant spider.
Should musicians stop touring?
Multiple concerts travelling around the world have a big impact on the environment.
Are ghosts real?
Plenty of people believe in ghosts, but it's hard to find proof.
SMASH STEREOTYPES
In an extract from his prize-winning book, scientist and writer Adam Rutherford shows you how to use the power of science to fight racism. This chapter, titled Myth-Busting, is all about sport.
Animal awareness
What would it feel like to be another animal?
Hamza Yassin
Go behind the camera with a wildlife filmmaker.
WILDLIFE WATCH
Ben Hoare goes on a safari from his sofa to discover how nature documentaries are made.
Big bum breakthrough
A team of researchers who found out that mammals can breathe through their bottoms have won a prize at the lg Nobel awards.
A jaw-dropping undersea snap
A photograph of a Bryde's whale feeding on a heart-shaped \"bait ball\" of sardines has won the Ocean Photographer of the Year contest.