Across
- 3. according to the nebular theory the solar system began as a wispy cloud of _____ and dust
- 7. the largest part in the structure of the universe
- 8. the big bang theory states that the universe began as an _________________
- 10. plants release _________
Down
- 1. the _______ belt is a region outside Neptune's orbit
- 2. one piece of evidence of the big bang is the presence of electromagnetic __________
- 4. all stars in the main sequence are going through nuclear _________
- 5. the temperature of the _______ is 6000Kelvin
- 6. color of the hottest stars
- 9. color the lowest temperature stars