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



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