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Unit 2 lesson 1
Universe Vocab
Term | Definition | |
---|---|---|
Revolution | is the movement of one object around a center or another objec | |
Rotation | the action of rotating around an axis or center | |
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. | |
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. | |
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. | |
Astronomical Unit | is a unit of length, roughly the distance from the Earth to the Sun. |