I’ve always wondered: Why are the stars, planets and moons round, when comets and asteroids aren’t?

This article was originally published at The Conversation. The publication contributed the article to Space.com’s Expert Voices: Op-Ed & Insights.

Jonti Horner, Professor (Astrophysics), University of Southern Queensland

“I’m puzzled as to why the planets, stars and moons are all round (when) other large and small objects such as asteroids and meteorites are irregular shapes?”

— Lionel Young, age 74, Launceston, Tasm

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