Across
- 1. system: collection of eight planets and their moons in orbit
- 3. all planets orbit
- 5. gravitational curved path of an object
- 7. process or act of turning or circling around something
- 9. the phases where the moon is less than half illuminated
- 10. the imaginary line around which a large round object, such as the Earth, turns
- 12. they orbit the sun
- 13. the alternate rising and falling of the sea
- 15. expanding in illumination
- 16. orbits around a planet
Down
- 2. movement of one object around a centre or another object
- 3. one of the four periods of the year
- 4. illuminated part greater than a semicircle
- 6. the shape of the illuminated (sunlit) portion of the Moon
- 8. the partial or total blocking of light of one celestial object by another
- 11. decreasing in illumination.
- 14. third planet from the sun