Across
- 4. A theory of how the universe began
- 5. The name given to the hypothetical primordial matter from which all the elements have formed.
- 7. A tool that astronomers use to view outer space
- 10. Dwarf plant
- 11. The biggest star in our solar system
Down
- 1. The most famous Italian astronomer
- 2. An alien
- 3. A small body of matter from outer space that enters the earth's atmosphere and burns up
- 6. The study of objects and phenomena beyond Earth
- 8. The only habitable planet
- 9. The hottest planet in our solar system