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Gravitational forces in protoplanetary disks may push super-Earths close to their stars

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Astronomers found that as planets form out of the chaotic churn of gravitational, hydrodynamic -- or, drag -- and magnetic forces and collisions within the dusty, gaseous protoplanetary disk that surrounds a star as a planetary system starts to form, the orbits of these planets eventually get in synch, causing them to slide -- follow the leader-style -- toward the star.

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"Gravitational forces in protoplanetary disks may push super-Earths close to their stars", MachPrinciple, May 12, 2019, https://machprinciple.com/post/Gravitational-forces-in-protoplanetary-disks-may-push-super-Earths-close-to-their-stars

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