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

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