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1 .This is Scientific American's 60-Second Space. I'm Michael Moyer. Got a minute?
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2 .Our Milky Way galaxy is on the heavy side.
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3 .We have hundreds of billions of stars, and an even more massive amount of dark matter.
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4 .Now astronomers have found the ying to the Milky Way's yang.
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5 .With just 1,000 stars, the dwarf galaxy Segue 2 becomes the smallest one known.
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6 .Researchers published measurements of the galaxy's size in the Astrophysical Journal.
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7 .Segue 2 is one of dozens of "companion" galaxies that orbit the Milky Way.
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8 .Scientists who model how galaxies form expect there to be thousands of small galaxies orbiting nearby, even if most are too faint to see with existing technology.
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9 .The discovery of Segue 2 offers astronomers a hint that the neighborhood around the Milky Way really is clumpy with tiny companions.
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10 .Researchers think that when Segue 2 first formed over 100 million years ago, it was much larger and brighter.
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11 .But repeated orbits around the Milky Way stripped away most of its membership.
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12 .The last thousand stars and a smattering of dark matter thus claim the title of smallest galaxy known.
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13 .For now.
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14 .Thanks for the minute, for Scientific American's 60-Second Space. I'm Michael Moyer.
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