Test de vocabulari:

1. synodic period

2. solar spicule

3. occultation

4. interstellar medium

5. minor-planet moon

6. polar orbit

7. terminator

8. escape velocity

9. Kelvin–Helmholtz mechanism

10. star catalogue

11. starfield

12. gravitational lens

13. stellar magnetic field

14. stellar evolution model

15. clearing the neighbourhood

16. Wilson–Bappu effect

17. sidereal period

18. O–C diagram

19. asterism

20. universe

Temps restant: 200 segons