Across
- 3. the universe seen as a well-ordered whole.
- 5. huge balls of gas held together by gravity
- 8. an instrument used to view distant objects
- 9. spherical balls of rock and/or gas that orbit a star that have enough of their own gravity to become round
- 11. about 186,000 miles per second (300,000 kilometers per second)
- 14. a group of about 100 to 400 billion stars formed in a disk-shaped spiral that contains our solar system
- 15. the amount of matter in an object
- 16. how far one object is from another
Down
- 1. a pattern in the stars that has been identified and named
- 2. everything that exists; all matter and energy. It also includes all of space and time.
- 4. the star at the center of our solar system
- 5. used to measure relative distances in space; in light years
- 6. Astronomical Unit equal to the average distance from the earth to the sun (93 million miles.)
- 7. irregular pieces of rock that move through space
- 10. the distance light travels in one year
- 12. the system made up of planets, and many smaller objects that orbit a star.
- 13. a group of hundreds of billions of stars held together by gravity