“690 Trillion Suns!” –Ancient Quasar’s Light So Bright It Obscured a Massive Unknown Galaxy Cluster

“We started asking ourselves why we had not found it earlier, because it’s very extreme in its properties and very bright,” says Michael McDonald, assistant professor of physics in MIT’s Kavli Institute for Astrophysics and Space Research. “It’s because we had preconceived notions of what a cluster should look like. And this didn’t conform to that, so we missed it.”

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