atmosphere - the layer of gases that surrounds the earth, axial tilt - the Earth's axis is tilted 231/ 2 degrees toward the North Star, axis - an imaginary line through a spinning object, revolution - the movement of one object around another object, rotation - one full spin of an object around an axis, satellite - any objects orbiting a star, planet or asteroid, including the man-made devices orbiting Earth used to gather data or receive and transmit radio signals, NASA - National Aeronautics and Space Administration, Solar System - the sun and all the things that revolve around it, terrestrial planet - one of the four innermost planets that is made of rock (Mercury, Venus, Earth and Mars are terrestrial planets), gas giant - one of the four large outermost planets that is made of mostly gas, tides - the rise and fall of the water level on earth that occurs times a day, gravity - a force that pulls two objects together, summer - the season when the northern hemisphere is tilted towards the sun, winter - the season when the northern hemisphere is tilted away from the sun,

Astronomy Vocabulary

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