Across
- 2. The coldest planet in our solar system
- 6. Closest planet to us
- 9. Used to count the distance between earth and stars
- 11. The planet with the biggest rings
- 15. A consept of many universes
- 16. The biggest black hole
- 18. The densest object in the universe
Down
- 1. Not a planet anymore
- 3. The closest galaxy to us
- 4. Happens when 2 neutron stars collide
- 5. The fastest element in the universe
- 7. Famous for its rings
- 8. Happens when a star comes to the end of its life
- 10. The only place where sound can be heard
- 12. Light can't escape from it
- 13. The "red" planet
- 14. Started 13.8 bllion years ago
- 17. The best telescope in this year