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



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