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Universe
Question | Answer | |
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Revolution | The motion of a body that travels around another body in space. | |
Rotation | The spinning of a body, such as a planet, on it's axis | |
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 | |
Astronomical Unit | a unit of measurement equal to 149.6 million kilometers, the mean distance from the center of the earth to the center of the sun |