Across
- 4. motion where Mars appears to wander through the sky
- 6. second planet from the sun
- 7. Cycle The appearance of the moon in its 28 day orbit of earth
- 8. the splitting of light into a spectrum
- 10. day the amount of time it takes for the earth to rotate 360
Down
- 1. Sphere the imaginary sphere that surrounds the earth
- 2. lens a lens where light is bent inwards
- 3. groupings of stars that can be seen in the sky. Traditionally used for navigation.
- 5. Total darkness
- 9. Almost total darkness