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Test de vocabulari:

1. positional astronomy

2. Kelvin–Helmholtz mechanism

3. magnitude

4. Tisserand's parameter

5. planetary differentiation

6. planetoid

7. UBV photometric system

8. universe

9. cis-Neptunian object

10. clearing the neighbourhood

11. corona

12. solar eclipse

13. coudé spectrograph

14. stellar remnant

15. orbit plot

16. heliocenter

17. perturbation

18. Local Group

19. subsatellite

20. minor axis

Temps restant: 200 segons