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



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