A newly discovered vast superstructure made up of 830 galaxies could be the largest object in the universe.
The distant wall of galaxy superclusters is so large it would take a billion light years just to cross it.
Galaxies such as our Milky Way are bound together into clusters, with each cluster making up a larger supercluster.
These can then link together in lines of galaxies known as walls which surround empty voids.
The Milky Way is part of a supercluster system known as Laniakea, while we also know of the Sloan Great Wall in the nearby universe.
While they are both very large, the newly discovered BOSS Great Wall - made up of 830 galaxies - is two-thirds bigger than either of them.
It was spotted by the Canary Islands Institute of Astrophysics, which looked at an area more than 4.5 billion light years away and found one system that stood out.
Researcher Heidi Lietzen told the New Scientist: "It was so much bigger than anything else in this volume."
But the calling the wall a "structure" is dispute - with Allison Coil from the University of California saying: "I don’t entirely understand why they are connecting all of these features together to call them a single structure.
"There are clearly kinks and bends in this structure that don’t exist, for example, in the Sloan Great Wall."
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