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1 .This is Scientific American's 60-Second Space. I'm John Matson. Got a minute?
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2 .The black hole at the center of the Milky Way is pretty mellow: well-fed and content.
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3 .But that wasn't always the case.
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4 .Black holes flare up when they consume large gulps of matter.
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5 .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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6 .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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7 .And they located what might be the remnant of a past feeding frenzy.
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8 .The research appears in the Astrophysical Journal.
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9 .The researchers spotted a huge cloud of plasma, some 300 light-years long, containing highly ionized atoms.
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10 .Supernovas could have energized the cloud, but it would have taken a lot of the exploding stars.
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11 .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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12 .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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13 .So it's good to live far from the galactic center, way out on our peaceful spiral arm.
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14 .Thanks for the minute, for Scientific American's 60-Second Space. I'm John Matson.
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