Across
- 6. a cluster os planets surrounding a star.
- 7. the movement of one object in a circular path around a second object.
- 9. the force that attracts objects to one another's mass.
Down
- 1. marks the shortest day of the year.
- 2. cycles are repeating patterns of events that occur due to the motion of the Earth & moon.
- 3. the movement of an object around a fixed point.
- 4. occurs when a region of the Earth is tilted toward the sun.
- 5. a cluster of stars orbiting a black hole.
- 8. when there is equal amounts of daylight and night.