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

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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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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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The galaxy is small, faint, and dominated by invisible dark matter.

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That combination obviously makes it very hard to see.

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Furthermore, it lies behind a shroud of dust that blocks any visible light from passing through.

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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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The stars are known as Cepheid variables.

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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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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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The finding is in the Astrophysical Journal Letters.

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Dwarf galaxies like this one are thought to contain more dark matter than regular matter.

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

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