Across
- 2. planets that are rocky and contain metals
- 3. the stretching of a wavelength when the light source is moving away from us.
- 6. mixture of frozen gases and tiny particles of dust.
- 9. space rock that burns through earth's atmosphere and hits ground
- 10. when light is moving toward us.
- 11. a group of stars or galaxies bound by gravity
- 12. the force that holds the galaxies together
- 15. a space rock
- 16. a collection of millions to billions of stars, dust, and gas.
- 17. a galaxy with no spiral arms and are spherical or oval-shaped.
- 18. the theory that says the universe was formed from the rapid and violent expansion of a single, dense point 13.8 billion years ago and continues to expand.
Down
- 1. the sum of all space, matter, and energy that exist, that have existed in the past, and that will exist in the future.
- 4. Matter that does not give off Electromagnetic Radiation. It is invisible and makes up about 85 percent of the total matter in the universe
- 5. a space rock that burns in the atmosphere
- 7. a galaxy shaped like a spiral
- 8. a cloud of dust and gas
- 13. a galaxy with no regular shape.
- 14. Gas Giant (planetss) that are not solid