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Orbit
The path that a body follows a it travels around another body in space
Momentum
A measure of how hard it is to stop a moving object
Period of Rotation
The time it takes an object to complete on rotation
Satellite
A moon, planet , or machine that orbits a planet or star
Solar Nebula
The sun, all the planets, all of the smaller bodies in the solar system - including moons, asteroids, and meteors- formed from a swirling cloud of gas and dust
Period of Revolution
The time it takes an object to travel once around the sun
Elliptical orbit
An oval shaped path like a slightly elongated circle
Gravity
A force of attraction between objects that is due to their masses
Greenhouse Effect
The natural process that occurs when certain gases in the atmosphere absorb and radiate thermal energy from the sun.
Extremophile
An organism that lives under extreme environmental conditions
Ozone
A gas molecule that is made up of three oxygen atoms
Atmosphere
A mixture of gases that surrounds a planet, moon, or other celestial body
Ultraviolet
Electromagnetic wave frequencies immediately above the visible range.
Habitable Zone
The area around a star where it is not too hot and not too cold for liquid water to exist on the surface of surrounding planets
