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Space telescope spies dark matter

Triangulation technique spots object at the edge of our Galaxy.

Astronomers have used telescopes on Earth and in space to nail the precise position of a mysterious, dark object at the outer edge of our Galaxy. The work could be an important step in understanding so-called dark matter — mysterious material that makes up about a quarter of our Universe.

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We have exoplanets transiting distant stars,and when they do so, the stars dim, the amount of dimming gives us a measure of the planet's mass, orbiting distance etc. But in this story we have the stars brightening. Perhaps the dimming and brightening effect could cancel out?

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