Across
- 2. type of Galaxy
- 5. first person to journey into outer space
- 8. space telescope
- 10. science of mapping stars and planets
- 11. a neutron star
- 13. Hg, a planet
- 14. seventeenth century astronomer
- 15. first person to walk on the Moon
- 16. once a planet, now a dwarf planet
- 18. "falling" or "shooting" star
Down
- 1. 20th century cosmologist
- 3. "evening star"
- 4. famous comet
- 6. small rocky body orbiting our sun
- 7. nearest major galaxy to the Milky Way
- 8. gas that fuels our sun
- 9. a moon of Jupiter
- 10. study of celestial objects
- 12. 'God of the sea' and a planet
- 17. astronomical body that orbiting a planet