ANSWERS:
1. C) Jupiter
2. B) Venus
3. B) A star explodes.
4. C) Spiral
5. C) Planet
6. B) Zhai Zhigang
7. A) Venus
8. B) Hydrogen into helium
9. B) Pluto
10. A) Sputnik 1
11. B) Yuri Gagarin
12. B) About 10 times
13. B) Mercury
14. A) Orbits in the opposite direction to most planets.
15. B) Its distance from the Sun
16. A) Valentina Tereshkova
17. A) Yang Liwei
18. B) Poland
19. A) Dumitru Prunariu
20. B) Venus
21. B) Hydrogen into helium
22. C) Eris
23. A) The moon's orbit is inclined relative to Earth's orbit.
24. A) Chris Hadfield
25. A) When the moon comes between the sun and Earth during a new moon.
26. C) Large, dark, basaltic plains formed by ancient volcanic eruptions.
27. B) Saturn
28. C) 1/18th
29. B) Venus
30. C) 84 years
31. C) Jupiter
32. C) Mercury
33. B) ESA
34. D) Operation Path Finder
35. A) Apollo 11
36. A) Sheikh Muszaphar Shukor
37. A) Sultan bin Salman Al Saud
38. B) Lunar eclipse
39. B) False
40. C) smart-1
41. A) October 4, 1957
42. A) Yuri Gagarin
43. B) Elliptical
44. B) 84 years
45. B) 27 times
46. B) Uranus
47. A) Venus
48. A) Hydrogen
49. D) Pluto
50. C) Alexei Leonov