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



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