1. Which planets are called inner planets?
Ans: Mercury, Venus, Earth, and Mars
2. Why are they called inner planets?
Ans: Because they are located closer to the Sun than the outer planets
3. What are inner planets also called?
Ans: Terrestrial planets
4. Why are inner planets called terrestrial planets?
Ans: Because they have rocky surfaces
5. Which planets are rocky planets?
Ans: Mercury, Venus, Earth, and Mars
6. Which planets lie before the asteroid belt?
Ans: The inner planets
7. Which is the smallest inner planet?
Ans: Mercury
8. Which is the largest inner planet?
Ans: Earth
9. How many inner planets are there?
Ans: Four
10. Do inner planets have solid surfaces?
Ans: Yes
11. Which is the closest planet to the Sun?
Ans: Mercury
12. Which is the smallest planet in the Solar System?
Ans: Mercury
13. Which inner planet has the shortest year?
Ans: Mercury
14. How many days does Mercury take to revolve around the Sun?
Ans: 88 days
15. Which planet has no atmosphere almost?
Ans: Mercury
16. Which planet has the greatest temperature difference between day and night?
Ans: Mercury
17. Does Mercury have any moon?
Ans: No
18. Which planet is heavily cratered like the Moon?
Ans: Mercury
19. Which inner planet rotates slowly but revolves quickly?
Ans: Mercury
20. Which inner planet is nearest to the Sun and also smallest?
Ans: Mercury
21. Which is the second planet from the Sun?
Ans: Venus
22. Which planet is known as Earth’s twin?
Ans: Venus
23. Which is the hottest planet in the Solar System?
Ans: Venus
24. Which planet is called the Morning Star?
Ans: Venus
25. Which planet is called the Evening Star?
Ans: Venus
26. Which inner planet rotates in the opposite direction?
Ans: Venus
27. Which planet has a day longer than its year?
Ans: Venus
28. Which planet has thick clouds of carbon dioxide?
Ans: Venus
29. Which planet has the strongest greenhouse effect?
Ans: Venus
30. Does Venus have any moon?
Ans: No
31. Which is the third planet from the Sun?
Ans: Earth
32. Which planet is known as the Blue Planet?
Ans: Earth
33. Which is the only known planet to support life?
Ans: Earth
34. Which planet has liquid water on its surface?
Ans: Earth
35. Which inner planet has one natural satellite?
Ans: Earth
36. What is Earth’s natural satellite?
Ans: Moon
37. Which inner planet has oxygen-rich atmosphere?
Ans: Earth
38. Which planet has the densest atmosphere among habitable planets?
Ans: Earth
39. Which inner planet has moderate temperature suitable for life?
Ans: Earth
40. Which inner planet is largest and densest?
Ans: Earth
41. Which is the fourth planet from the Sun?
Ans: Mars
42. Which planet is called the Red Planet?
Ans: Mars
43. Why is Mars called the Red Planet?
Ans: Due to iron oxide (rust) on its surface
44. Which inner planet has the largest volcano, Olympus Mons?
Ans: Mars
45. Which inner planet has two moons?
Ans: Mars
46. What are the two moons of Mars?
Ans: Phobos and Deimos
47. Which planet is considered most suitable for future human missions?
Ans: Mars
48. Which inner planet has polar ice caps?
Ans: Mars
49. Which inner planet has a thin carbon dioxide atmosphere?
Ans: Mars
50. Which inner planet is most studied for possibility of past life?
Ans: Mars
51. Which inner planet is nearest to the asteroid belt?
Ans: Mars
52. Which inner planet has the highest average density?
Ans: Earth
53. Which inner planet has the weakest gravity?
Ans: Mercury
54. Which inner planet has the thickest atmosphere?
Ans: Venus
55. Which inner planet has the thinnest atmosphere?
Ans: Mercury
56. Which inner planet has the highest mountain/volcano in the Solar System?
Ans: Mars
57. Which inner planet has the largest canyon, Valles Marineris?
Ans: Mars
58. Which inner planet has the strongest surface gravity?
Ans: Earth
59. Which inner planet has clouds mainly made of sulfuric acid?
Ans: Venus
60. Which inner planet has the shortest revolution period?
Ans: Mercury
61. Which inner planet has the longest revolution period?
Ans: Mars
62. Which inner planet takes about 687 Earth days to orbit the Sun?
Ans: Mars
63. Which inner planet takes about 225 Earth days to orbit the Sun?
Ans: Venus
64. Which inner planet takes about 365¼ days to orbit the Sun?
Ans: Earth
65. Which inner planet takes about 88 Earth days to orbit the Sun?
Ans: Mercury
66. Which inner planet is often visible just before sunrise or after sunset?
Ans: Venus
67. Which inner planet is called Earth’s sister planet because of similar size?
Ans: Venus
68. Which inner planet is famous for global dust storms?
Ans: Mars
69. Which inner planet has a large iron core compared to its size?
Ans: Mercury
70. Which inner planet has the most suitable environment for human life?
Ans: Earth
71. Which inner planet is closest in size to Earth?
Ans: Venus
72. Which inner planet is the brightest planet in the sky?
Ans: Venus
73. Which inner planet appears reddish because of oxidized iron?
Ans: Mars
74. Which inner planet has a bluish appearance when seen from space?
Ans: Earth
75. Which inner planet is often called the most Earth-like in terms of day length?
Ans: Mars
76. Which inner planet has the least number of missions among the four?
Ans: Mercury
77. Which mission made India famous in planetary exploration?
Ans: Mangalyaan
78. Which mission first landed successfully on Mars?
Ans: Viking 1
79. Which mission mapped Mercury in detail?
Ans: MESSENGER
80. What does MESSENGER stand for?
Ans: Mercury Surface, Space Environment, Geochemistry, and Ranging