Planetary-mass object

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What Wikipedia says

A planetary-mass object (PMO), planemo, or planetary body (sometimes referred to as a world) is, by geophysical definition of celestial objects, any celestial object massive enough to achieve hydrostatic equilibrium and assume an ellipsoid shape, but not enough to sustain core fusion like a star.

Excerpt from the Wikipedia article “Planetary-mass object”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Paul Stansifer, 84user, NASA, Celestia, JPL/Caltech, GPLv2, via Wikimedia Commons.