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1 .This is Scientific American 60-Second Space. I'm Clara Moskowitz. Got a minute?
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2 .Dark matter is that mysterious stuff that apparently accounts for some quarter of the mass and energy in the universe.
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3 .And for one small wannabe-galaxy, dark matter may have been a lifesaver.
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4 .It's called the Smith Cloud.
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5 .Astronomers think it's a failed dwarf galaxy that lacked the requisite mass to produce stars.
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6 .Many millions of years ago the cloud seems to have collided with the Milky Way and passed through the disk of our galaxy.
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7 .A new computer simulation finds that the cloud should have been ripped to shreds.
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8 .That it survived is evidence that it's protected by a shell of dark matter.
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9 .The report will appear in the journal Monthly Notices of the Royal Astronomical Society.
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10 .That dark matter shell could have insulated the Smith Cloud from the Milky Way's gravitational forces, which otherwise should have torn Smith apart.
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11 .As if its first fender-bender with the Milky Way wasn't enough, the Smith Cloud is coming back for more.
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12 .It's on course to slam into our galaxy again, in about 30 million years.
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13 .Perhaps future astronomers will note whether its dark matter shroud once again saves the cloud.
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14 .Thanks for the minute, for Scientific American 60-Second Space. I'm Clara Moskowitz.
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