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Why are all planetary systems and most galaxies disk-shaped? | Astronomy.com

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Why are all planetary systems and most galaxies disk-shaped?

FROM THE May 2011 ISSUE

Why are all planetary systems and most galaxies disk-shaped?

Jaison Solomon, Trivandrum, India

Published: Monday, March 28, 2011

Face-on spiral galaxy NGC 3982. NASA/ESA/the Hubble Heritage Team (STScI/AURA)

The force of gravity makes some objects, such as the Sun, spherical. Spin plus gravity equals a rotating disk with a vertical thickness much less than its radius.