The word planet means 'wanderer'. This is because the planets do appear to wander listlessly across the night sky. The stars also move across the sky east to west but relative to each other, they appear fixed. The planets, on the other hand, seem to move relative to the fixed stars in backward and forwards directions.
What is a planet easy definition?
A planet is a celestial body that (a) is in orbit around the Sun, (b) has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a hydrostatic equilibrium (nearly round) shape, and (c) has cleared the neighbourhood around its orbit.
