What are the essential features of a planet?
A planet is a celestial body that orbits around a star.
It has an adequate mass for its own gravity to get on top of rigid body forces so that it assumes a hydrostatic equilibrium to make it round.
Planets are smaller than stars.
In our Solar System there are two categories of planets:
Inner planets, which are close to the Sun. These are Mercury, Venus, Earth , and Mars.
Outer planets, which come after an asteroid belt and are at a farther distance from the Sun. These are Jupiter, Saturn , Uranus, and Neptune.
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