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1 .This is Scientific American 60-Second Space. I'm Clara Moskowitz. Got a minute?
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2 .Four stars near the bright band of the Milky Way have revealed a secret: the presence of a hidden dwarf galaxy.
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3 .Six years ago astronomers predicted that such a galaxy might be in that region based on observed ripples in the Milky Way's disk.
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4 .The galaxy is small, faint, and dominated by invisible dark matter.
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5 .That combination obviously makes it very hard to see.
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6 .Furthermore, it lies behind a shroud of dust that blocks any visible light from passing through.
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7 .Now scientists have identified four stars that appear to belong to the galaxy by examining infrared light, which can cut through dust.
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8 .The stars are known as Cepheid variables.
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9 .They pulse brighter and dimmer in a predictable pattern, which allows astronomers to determine how far they are from us, about 300,000 light years.
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10 .That distance puts them well beyond the main body of the Milky Way and right where an orbiting dwarf galaxy might lie.
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11 .The finding is in the Astrophysical Journal Letters.
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12 .Dwarf galaxies like this one are thought to contain more dark matter than regular matter.
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13 .So tracking down such dwarfs could give researchers more clues in the quest to figure out what dark matter is made of.
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14 .Thanks for the minute, for Scientific American 60-Second Space. I'm Clara Moskowitz.
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