31. Which planet of the solar system spins on its axis at the fastest rate?
32. To a space traveller on moon, the lunar sky during day time appears ________
33. The time required by moonlight to reach the earth is ________
34. Comets moves around the
35. The planets are kept in motion in their respective orbits by ________
36. Which of the following celestial bodies bear, 'The Sea of Tranquility' and 'The Ocean of Storms' ?
37. Who founded the word "Geography"?
38. The Saturn rings were discovered by ________
39. The same side of the moon always faces the Earth because ________
40. The orbits of planets around the Sun, or of satellites around the Earth, can be ________
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