Across
- 4. The name of Uranus' finder
- 5. The study of celestial objects
- 8. (plural) The widely known title given to extraterrestrial life
Down
- 1. The shape of our moon
- 2. 'Father' of the solar system
- 3. Our home
- 6. The heart of our solar system
- 7. The closest planet to the sun