Across
- 2. everything we can see, touch, hear, sense.
- 7. distance between waves
- 8. what the earth does around the sun.
- 9. galaxy- stars concentrated in sprial arms.
- 10. where all light comes from
- 13. galaxy- between other galaxies.
- 14. year-distance light travels
- 16. galaxy- doesn't have a shape.
- 18. way galaxy- where our solar system is
Down
- 1. explosion in space
- 3. galaxy- no internal structure.
- 4. affect- light and wavelengths.
- 5. cloud of gas and dust.
- 6. dust and light held together by gravity.
- 10. object in space.
- 11. arms- extend from the center of sprial galaxies.
- 12. russell diagram- scatter plot of stars
- 15. hole- sucks up things in space
- 17. bang theory- how the universe was made