Space

5. Minor Planets that are not comets
6. A small particle from a comet or asteroid
7. An area in the Earth's upper atmosphere which absorbs many of the lethal radiations coming from space
10. Second planet closest to the sun
12. When our view of one object in the sky is blocked by either another object or the Earth's shadow
14. The distance which a ray of light would travel in one year. This is about 6,000,000,000,000 (6 trillion) miles.
15. The star that it is in the centre of the solar system
16. Second biggest planet, also a gas giant and is surrounded with icy rings
18. A group of stars, gas and dust held together by gravity
19. Described as the "Red Planet", named after the Roman God of war

1. A cloud of gas and dust
2. Negative particle which orbits an atom
3. Biggest planet and is a gas giant
4. Scientists that study about space and astronomy
6. Smallest and closest planet to the Sun
8. The planet that can sustain living creatures
9. Icy small Solar System Body
11. A special kind of elongated circle. The orbits of the solar system planets form ellipses.
13. A dwarf planet that used to be a part of the solar system
17. Seventh planet from the sun