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This is Scientific American's 60-Second Space. I'm John Matson. Got a minute?

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Black holes tend to be pretty massive.

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The one at the center of our galaxy is about four million times the mass of the sun.

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But that's puny compared with the whopper that researchers discovered last year in an otherwise unremarkable galaxy called NGC 1277.

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Its black hole is some 17 billion times the mass of the sun.

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By typical standards, such a black hole is about 100 times too massive for that galaxy.

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The discovery got researchers wondering how the mismatch came about.

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One idea, albeit a speculative one is that the black hole actually came from a different galaxy.

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Say the black hole formed from the merger of two smaller black holes in a larger galaxy nearby.

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The recoil from that violent event could have flung the ultramassive black hole into space.

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Where it wandered, among a cluster of galaxies, before settling into a new home in NGC 1277.

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The hypothesis is in the Astrophysical Journal Letters.

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The paper's authors note that the runaway black hole scenario requires the confluence of seemingly unlikely events.

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But the universe is a big place, where improbable things happen all the time.

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Look at you.

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Thanks for the minute, for Scientific American's 60-Second Space. I'm John Matson.

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