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



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