Across
- 2. The movement of the earth about its axis.
- 3. the vast open space which includes everything that exists as matter or energy.
- 5. the name of our galaxy
- 7. the heavenly bodies which move around the sun.
- 8. the movement of the planets around the sun.
- 9. the sun is a huge ball of burning _________.
Down
- 1. a group of stars which forms a recognizable pattern in the sky.
- 4. the only natural _____________ of earth is moon.
- 6. a constellation
- 10. the head of the solar system.