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Vocabulary Quiz:

1. terminator

2. axis of rotation

3. protostar

4. supermassive black hole

5. satellite galaxy

6. stellar dynamics

7. Kuiper belt

8. orbital period

9. total solar eclipse

10. Oort cloud

11. absolute magnitude

12. horizon

13. orbit

14. moment of inertia factor

15. two-body problem

16. orbital eccentricity

17. aspect

18. flare star

19. active galactic nucleus

20. planetary

Time left: 200 seconds