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Universe
Term | Definition |
---|---|
Universe | All existing matter and space considered as a whole |
Light-Year | A unit of astronomical distance that light travels in one year |
Solar System | The collection of eight planets and their moons in orbit around the sun. |
Galaxy | A system of millions or billions of stars |
Planet | A celestial body moving in an elliptical orbit around a star |
Star | A fixed luminous point in the night sky that is a large, remote incandescent body like the sun |
Astronomical unit | A unit of measurement equal to 149.6 million kilometers |