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This is Scientific American 60-Second Space. I'm Clara Moskowitz. Got a minute?

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Dark matter is that mysterious stuff that apparently accounts for some quarter of the mass and energy in the universe.

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And for one small wannabe-galaxy, dark matter may have been a lifesaver.

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It's called the Smith Cloud.

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Astronomers think it's a failed dwarf galaxy that lacked the requisite mass to produce stars.

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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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A new computer simulation finds that the cloud should have been ripped to shreds.

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That it survived is evidence that it's protected by a shell of dark matter.

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The report will appear in the journal Monthly Notices of the Royal Astronomical Society.

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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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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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It's on course to slam into our galaxy again, in about 30 million years.

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Perhaps future astronomers will note whether its dark matter shroud once again saves the cloud.

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Thanks for the minute, for Scientific American 60-Second Space. I'm Clara Moskowitz.

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