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Q4 Vocabulary
Term | Definition |
---|---|
Lightyear | The distance that light travels in one year. |
Astronomical Unit (AU) | It equals the average. Distance measured from the center of the sub to the canter of earth. |
Universe | All of the space and everything in it. |
Galaxy | A huge group of single stars, star system, star cluster, dust, and gas bound together by gravity. |
Celestial Objects |