How to Weigh a Planet

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From hanging a plumbob near a Scottish mountain, to watching a starless world act like a planet-sized lens from two vantage points at once, scientists have devised a lot of ways to calculate a planet's mass.

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Sources: https://docs.google.com/document/d/e/2PACX-1vTRCDF7sigbPRmlnZRJtrPRlt-XvpdxZtICzvhifv_ST5FAhhitx6RoFrnQ-fBhSA-h29auUb9pnSuX/pub