Across
- 1. Stars seem to move due to ...... of Earth.
- 5. Dwarf planet in our solar system.
- 6. Made of ice, dust and rocky materials.
- 7. The planet that does not have an atmosphere.
- 9. Made of metals and rocky materials.
- 10. Imaginary line on which Earth rotates.
Down
- 2. The most distant planet in our solar system.
- 3. Model where Earth is center of solar system.
- 4. Used to observe space.
- 8. Collection of star systems.