6. Our sun is this.
7. The farthest planet from the sun.
8. Planet closest to the sun.
11. Planet named after the sea god.
12. Planet known as the evening star.
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14. The path that a planet takes around the sun.
16. One of many 'rocks' in a belt between Mars and Jupiter.
17. The force that holds planets in their orbits.
18. Planet famous for its rings.
19. An icy rock that has bright tail when it comes close to the sun.
20. Earth's companion.
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