The Solar System

2. Methane in this planets atmosphere gives it its blue tint
6. Surname of the first astronaut to walk upon the moon
7. The planet which takes 365 days to orbit the sun
9. The government agency of the USA which researches space and sends astronauts on missions
11. The planet closest to the sun
12. The term which means the planet is spinning in the opposite direction to other planets
13. The gas giant that is furthest from the sun
15. The term given to the model of solar system that puts the sun at the middle
18. This planet is most famous for its set of rings
19. Now known as a dwarf planet

1. The largest planet in the Solar System
3. Planet covered in clouds of sulphuric acids and spins in retrograde
4. This red planet was named after the Roman god of war
5. The term given to a scientist who studies planets
8. The moon does not have one of these, therefore it has no protection against cosmic rays, meteors or solar winds
10. The type of planets that are closest to the sun
11. A piece of stony or metallic debris that travels in outer space
14. The galaxy in which Earth belongs
16. Name of the instrument used to look at planets, stars and objects in space
17. This planet controls the tides on Earth