Space Crossword

2. the study of the universe.
4. twice a year when the day and night are the same amount of time all around the world.
5. the path one object takes around another.
7. shaped like or forming a ring.
8. the lowest part of the Earth's atmosphere.
9. the study of the moons surface.
10. a negative particle which orbits an element.
11. when our view of an object in the sky is blocked by either earth's shadow or another object.
12. the only planet with visible rings.
13. study of the Earth using physics.

1. a sensitive radiation detector.
3. a star that suddenly flares up to many times its original brightness before fading again.
6. a grouping of stars named because of the way they look.