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

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The black hole at the center of the Milky Way is pretty mellow: well-fed and content.

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But that wasn't always the case.

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Black holes flare up when they consume large gulps of matter.

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The doomed material compresses and heats up around the exterior of the black hole, glowing brightly, including in x-ray light.

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Researchers in Japan used an x-ray telescope on the Suzaku satellite to scan the region just south of our galaxy's black hole.

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And they located what might be the remnant of a past feeding frenzy.

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The research appears in the Astrophysical Journal.

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The researchers spotted a huge cloud of plasma, some 300 light-years long, containing highly ionized atoms.

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Supernovas could have energized the cloud, but it would have taken a lot of the exploding stars.

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The more dramatic possibility is that the Milky Way's black hole flared up about 100,000 years ago, heating and ionizing the plasma cloud.

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Recent studies have uncovered evidence for even more ancient black hole flare-ups, as well as outbursts as recently as 300 years ago.

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So it's good to live far from the galactic center, way out on our peaceful spiral arm.

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

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