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



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