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Vocabulary
Term | Definition |
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Astronomical Unit | is a unit of length, roughly the distance from the Earth to the Sun |
Revolution | a forcible overthrow of a government or social order in favor of a new system |
Rotation | the action of rotating around an axis or center |
Solar System | the collection of eight planets and their moons in orbit around the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets |
Galaxy | a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction |
Planet | a celestial body moving in an elliptical orbit around a star |
Light year | a unit of astronomical distance equivalent to the distance that light travels in one year |
Star | a fixed luminous point in the night sky that is a large, remote incandescent body like the sun |
Universe | all existing matter and space considered as a whole; the cosmos. The universe is believed to be at least 10 billion light years in diameter and contains a vast number of galaxies |