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Planets, orbits, and comets are somewhat round. Is there an underlying mechanism or physical law? | Astronomy.com

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Planets, orbits, and comets are somewhat round. Is there an underlying mechanism or physical law?

FROM THE October 2012 ISSUE

Planets, orbits, and comets are somewhat round. Is there an underlying mechanism or physical law?

William J. Lyons, Marshfield, Massachusetts

Published: Tuesday, August 28, 2012

Yes, gravity pulls material toward a central point. The force of gravity is also responsible for the elliptical, and occasionally circular, shapes of orbits.

Astronomy magazine subscribers can read the full answer for free. Just make sure you're registered with the website.