Across
- 2. Planetesimals accreted more matter to become planets.
- 6. A tiny fraction of this energy reaches and sustains Earth.
- 7. moving backward; having a backward motion or direction; retiring or retreating. inverse or reversed, as order.
- 8. a hypothesis that is supported by the results of experimentation and observation.
- 10. It is slightly larger than our Moon.
Down
- 1. supported the big bang hypothesis
- 3. is a rule that correctly describes a natural phenomenon.
- 4. Is the next closest planet to the Sun, but is the hottest
- 5. when a light source is moving toward an observer, the wavelengths appear shorter.
- 6. their color is indicated by its temperature
- 9. third planet from the sun