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Basic Astronomy Terms
Enter the number from the column to the left into the text box next to the appropriate word in the right-hand column.
1. the tendency of a body at rest to stay at rest, and of a body in motion to stay in motion, unless acted upon by another force light year
2. the path a satellite travels around a larger object gravity
3. a natural object surrounded by the vacuum of space universe
4. the relatively empty area between and around stars, planets, and other celestial bodies astronomical unit
5. the area containing all matter, energy, and space The Big Bang
6. the force of attraction between all objects space
7. unit of distance equal to 3.26 light years solar system
8. a star and all of its satellites orbit
9. the average distance from the earth to the sun (about 93 million miles; or 149.6 million kilometers) celestial body
10. the distance light travels in one year (about 5.88 trillion miles; or 9.45 trillion kilometers) parsec
11. an object (natural or manmade) that is held by gravity and inertia in a circular or elliptical path around a larger object satellite
12. an explosion that scientists believe occurred at the beginning of our universe; it is thought that after this explosion the first celestial bodies formed inertia



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