You can estimate the mass of our planet by observing the Moon and using Kepler’s 3rd law Posted on 2020/12/02 by Carl Robitaille You can estimate the mass of our planet by observing the Moon and using Kepler's 3rd law pic.twitter.com/Q1KBvbYJKO— Tamás Görbe (@TamasGorbe) December 2, 2020