Astronomy

1. 4th planet from the Sun. Known as the red planet
5. A medium sized star at the center of our solar system
7. A curved path that a celestial body takes
8. Known for its rings
10. The planet we live on currently
13. A natural object that orbits the Sun
15. A system of the Sun, the planets, their moons, and everything else that revolves around the Sun
18. All of space and everything in it
19. Use to be considered a planet. Is sometimes closer to the Sun than Neptune
20. Gas giant. Largest planet in our solar system
21. Large spherical object that orbits the Sun

2. The spinning of a plant around its axis
3. Astronomical Unit. Distance from the Earth to the Sun. Equal to 150,000,000km.
4. Clusters of stars in the sky that appear in a particular pattern
6. Windy planet. 8th planet from the Sun
9. Coldest planet. 7th planet from the Sun
11. An imaginary line that a planet rotates around
12. A system of dust, gas, and many millions of stars
13. The closest planet to the Sun
14. The movement of one object around another
16. Second planet from the Sun. Cloud covered and very bright
17. a massive, self-luminous body of gas