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universe
learning about the universe
| Term | Definition |
|---|---|
| astronomical unit | a unit of length used for distances within the solar system; equal to the mean distance between the Earth and the Sun (approximately 93 million miles or 150 million kilometers) |
| 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. the action or system of rotating crops. |
| 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. the galaxy of which the solar system is a part; the Milky Way. |
| light year | a unit of astronomical distance equivalent to the distance that light travels in one year, which is 9.4607 × 10<sup>12</sup> km (nearly 6 trillion miles). |
| 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. |
| planet | a celestial body moving in an elliptical orbit around a star. the earth. |
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