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