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



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