Across
- 3. formed seventy five billion years ago
- 4. how many degrees are in one hemisphere
- 5. our galaxies name
- 6. the oldest fossils are how old
- 7. all the stars planets oceans and organisms are made of what
- 10. who mixed the early atmosphere gases in a closed container
- 11. how long did rain fall before the oceans formed
- 12. what formed from millers experiment
- 15. there are more of this than stars in the milky way
- 17. what object can give us information on how solid planets formed
Down
- 1. in six billion years the sun will turn into a
- 2. how long ago the big bang occurred
- 8. a solar nebula is like what
- 9. how long until the sun engulfs its self
- 13. the ozone protects us from what
- 14. earth and the oceans are an indirect result of what
- 16. stars form in what