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Weighing an alien exoplanet by watching it throw around its star

21 Aug 2018, 23:15 UTC
Weighing an alien exoplanet by watching it throw around its star ESO/A.-M. Lagrange et al.

This is exceedingly cool: Astronomers have used a very clever technique to “weigh” an exoplanet, a planet orbiting another star. By very carefully watching the motion of the star through the sky, they’ve been able to see the changes to its trajectory by the orbiting planet, allowing them to get its mass.

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