Celestial mechanics is a division of astronomy dealing with the motions and gravitational effects of celestialobjects.
Isaac Newton is credited with introducing the idea that the motion of objects in the heavens, such as planets, the Sun, and the Moon, and the motion of objects on the ground, like cannon balls and falling apples, could be described by the same set of physical laws.
Celestial motion without additional forces such as thrust of a rocket, is governed by gravitational acceleration of masses due to other masses.
According to the Hertzsprung-Russell diagram, a red giant is a large non-main sequence star of stellar classification K or M; so-named because of the reddish appearance of the cooler giants.
NGC 6543, the Cats Eye Nebula A planetarynebula is an astronomical object consisting of a glowing shell of gas formed by certain types of stars at the end of their lives.
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