Across
- 3. radiation A radiant energy that creates electromagnetic energy
- 4. the rising and falling of the sea
- 6. two or more objects orbiting each other and have a center mass
- 7. the study of the universe
- 8. to divide or split somethings into more than two parts
- 9. phases different appearances of the moon seen from earth
Down
- 1. 3 laws that describe the motion of the planets across the sky
- 2. the action of rotating around an axis
- 5. the periodic variation of the incline of the axis on a rotating object
- 8. the result of joining two or more things together to make one thing