"Space Crossword": HTML5 Crossword

Across

3. The red planet (4)
4. The path of a planet around a star (5)
6. The hottest planet in the Solar System (5)
7. The nationality of the first man in space (7)
9. Vehicle to transport people into space (6)
10. No longer a planet (5)
11. This was left on the moon (10)
13. The time it takes for a planet to complete an orbit (4)
14. These is found in between Mars and Jupiter (9)
15. Some planets are made of rock and some are made (5)
16. A natural satellite (4)
17. One of the gases that is found in the Sun (8)
18. The number of planets that have been discovered in our Solar System (5)

Down

1. Our planet (5)
2. Planet closest to the Sun (7)
5. Largest planet in the Solar System (7)
8. The group of planets and star that Earth is part of (11)
12. Neil The first man to walk on the moon (9)