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



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