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What is the difference between a planetesimal and a dwarf planet? | Astronomy.com

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What is the difference between a planetesimal and a dwarf planet?

What is the difference between a planetesimal and a dwarf planet?

Robert Anton, Santa Magarita, California

Published: Saturday, March 01, 2008

The term "planetesimal" refers to small bodies that orbited the Sun prior to the planets' formation. In 2006, the International Astronomical Union (IAU) ruled that a "dwarf planet" is a nearly spherical celestial body orbiting the Sun that has not cleared its orbital path of debris, as have the traditional planets.