The Largest Structure Ever Observed in the Universe

More

At 4 *billion* light years across, this quote-unquote "object" throws astronomical assumptions that go back to Einstein into doubt.

huge-lqg.png

A computer visualization of quasar cluster U1.27 or, more colloquially, Huge-LQG, the largest object ever identified in the universe (Roger G. Clowes)

Those dots may not look like much, but they represent the 73 quasars that in all make up the largest object ever discovered in our observable universe. At its longest, the quasar group (known technically as U1.27 but more colloquially as Huge-LQG for "large quasar group") runs about 4 *billion* light years, and about 1.6 billion at most points. For comparison, our Milky Way galaxy is approximately just ("just") 100,000 light years across.

Each of the 73 quasars is (or was, as the light has traveled billions of years to reach our telescopes) the center of a galaxy in the early universe. The group was discovered by a team led by Roger G. Clowes at the University of Central Lancashire in the data provided by the Sloan Digital Sky Survey and published in Monthly Notices of the Royal Astronomical Society on Friday.

The Huge-LQG is located very near to another quasar cluster, discovered by Clowes in 1991, known as Clowes & Campusano LQG (CCLQG). Because the Huge-LQG is so, well, huge, and particularly because it is located so near another huge object, the results throw into doubt the cosmological principle, an assumption that traces back to Einstein, which presupposed that given a large enough scale, the universe should look the same everywhere you look. But with an object this extraordinarily large, it seems that that region of the universe is quite unusual. Even given the cosmological principle, you expect to see some unusually large features, but the Huge-LQG exceeds even the largest expected size "substantially," Clowes wrote to me over email. "Some of our previous findings came close, but didn't exceed it. This one does."

Clowes wrote to me over email, explaining that the cosmological principle has "seemed plausible, but it's never really been demonstrated beyond reasonable doubt." Over time we have tried to tinker with the homogeneity scale of the cosmological principle to accommodate for unusually large objects. "But," Clowes writes, "this is a few percent of the size of the observable universe, so we might not be able to do that kind of thing any more."

Jump to comments
Presented by

Rebecca J. Rosen is a senior editor at The Atlantic, where she oversees the Business Channel. She was previously an associate editor at The Wilson Quarterly.

Get Today's Top Stories in Your Inbox (preview)

Tracing Sriracha's Origin to a Seaside Town in Thailand

Ever wonder how the wildly popular hot sauce got its name? It all started in Si Racha.


Elsewhere on the web

Join the Discussion

After you comment, click Post. If you’re not already logged in you will be asked to log in or register. blog comments powered by Disqus

Video

Where the Wild Things Go

A government facility outside of Denver houses more than a million products of the illegal wildlife trade, from tigers and bears to bald eagles.

Video

Adults Need Playtime Too

When was the last time you played your favorite childhood game?

Video

Is Wine Healthy?

James Hamblin prepares to impress his date with knowledge about the health benefits of wine.

Video

The World's Largest Balloon Festival

Nine days, more than 700 balloons, and a whole lot of hot air

Writers

Up
Down

More in Technology

Just In