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This is Scientific American's 60-Second Space. I'm John Matson. Got a minute?

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Weighing the Milky Way is no easy task.

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It's not like you can just step outside the galaxy and place it on a humongous scale.

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Plus, most of the galaxy's heft is in invisible dark matter, which betrays its presence only through its gravitational pull.

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So astronomers have devised clever ways of inferring the mass of our galaxy by measuring how it pulls on smaller objects moving around it.

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A new estimate, based on its effect on the motion of a nearby dwarf galaxy, has the Milky Way a bit beefier than some past measurements that relied on the motions of massive stars.

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The study is in the Astrophysical Journal.

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The researchers first used the Hubble Space Telescope to track the dwarf galaxy Leo I,

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which at 850,000 light-years away is one of the most distant of the satellite galaxies swarming around the Milky Way.

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Then they simulated galaxies able to host such an object.

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Turns out that anything less massive than one trillion suns is very unlikely.

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In fact, the researchers estimate that the Milky Way's dark matter has as much mass as 1.6 trillion suns.

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That's some pretty heavy-duty astrophysics.

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Thanks for the minute, for Scientific American's 60-Second Space. I'm John Matson.

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