Q1. What are Planets?
They are bodies revolving around the Sun, and at the same time rotating on their own axis.
Q2. How many planets are there and arrange them in the order from the Sun?
Eight.
1. Mercury;
2. Venus;
3. Earth;
4. Mars;
5.Jupiter;
6. Saturn;
7. Uranus and
8. Neptune.
Q3. Prior to August 2006 it was nine planets in the solar system. Which is the planet that got declassified as a dwarf planet?
Pluto.
Q4. What are "Terrestrial Planets"?
Planets in the inner circle are called so. They are Mercury, Venus, Earth and Mars.
Q5. What are "Giant Planets"?
Planets in the outer circle are called so. They are Jupiter, Saturn, Uranus, Neptune. (Earlier Pluto was also included in this).
Q6. Which is the first planet from the Sun?
Mercury. It is about 57909175 Kms from Sun. Obviously it is the nearest planet to the Sun.
Q7. What is the temperature range in Mercury?
Minus 183 degree Celsius to 427 degree Celcius. It is the 2nd hottest planet.
Q8. How much time does Mercury take to complete one revolution (orbit) around the Sun?
88 days. (87.969 days)
Q9. Mercury is the ?
Fastest planet in the system.
Q10. Which is the smallest planet in the solar system?
Mercury. Dia 4880 Kms.
Q11. How much time does Mercury take to rotate on its own axis?
58.65 days (58.5462 days)
Q12. Does Planet Mercury has any satellite?
No.
Q13. Which is the second planet from the Sun?
VENUS - 108298930 Kms from the Sun, with a dia of about 12103.6 Kms.
Q14. Which is the brightest object in the sky after Sun and Moon?
Venus.
Q15. Planet Venus is also called as?
Morning and Evening Star.
Q16. Which is the closest planet to the Earth?
Venus. It is also slightly smaller, by about 500 Kms in dia to the Earth.
Q17. In which direction does the planet Venus rotate on its own axis?
Anti-clock wise.
Q18. Planet Venus is the?
Hottest Planet. The temperature is around 460 degree Celsius.
Q19. How much time does planet Venus take to complete one revolution around the Sun?
224.7 days.
Q20. Planet Venus spins in which direction?
East to West.
Q21. Planet Venus is named after the?
Greek Goddess of Beauty.
Q22. Planet Venus has?
No satellites, rings or ice caps.
Q23. What is the major content of planet Venus?
96.5% Carbon-di-oxide and 3.5% Nitrogen.
Q24. What is the order of planet Earth?
Third from the Sun. (More details on "Earth")
Q25. By mass, what is the order of planet Earth?
Fifth largest in the solar system.
Q26. Which is the fourth planet from the Sun?
Mars - 227940000 Kms from the Sun.
Q27. How is planet Mars also known?
Red Planet.
Q28. What is the cause for the reddishness of the planet Mars?
Oxidation.
Q29. What are the satellites for Mars?
Two - Phobos (Fear) and Deimor (Terror).
Q30. What physical features of Mars is the cause for the Summer and Winter in the Hemisphere?
The tilt in its axis, enables the polar regions getting exposed to sunlight,alternatively giving each Hemisphere the summer and winter.
Q31. What is the length of day in planet Mars?
24.7 Hrs. closest to the Earth's.
Q32. What is the average distance of Mars from Sun?
227940000 Kms from the Sun.
Q33. What is the diameter of Mars?
6794 Kms.
Q34. How much time does Mars take to rotate on its own axis?
1.025957 days.
Q35. How much time does Mars take to complete one revolution around Sun?
686.98 days.
Q36. Which is the fifth planet from the Sun?
Jupiter - 778412010 Kms from the Sun. It is in the center of the order of planets.
Q37. By are Jupiter is the?
Largest planet in the system.
Q38. How big is Jupiter in comparison to other planets?
One and a half times more than all the planets put together.
Q39. Planet Jupiter is also called?
Giant Planet.
Q40. What is the most conspicuous aspect of Planet Jupiter?
The Great Red Spot.
Q41. How many satellites are there for Jupiter?
Sixteen.
Q42. Which are the most prominent satellites of Jupiter?
Ganimede, Europa, and Callisto.
Q43. How much time does Jupiter take to rotate on its own axis?
9 Hours and 50 minutes.
Q44. How much time does Jupiter take to complete one revolution around Sun?
11 Years and 314 days.
Q45. How many rings are there for Jupiter?
Only one.
Q46. The first space probe to flypast Jupiter is?
Pioneer 10 - USA - 3.12.1973.
Q47. Who discovered the four largest satellites of Jupiter?
Gallileo Gallilei.
Q48. What is the order of planet Saturn from Sun?
Sixth - 1426725400 Kms from the Sun.
Q49. What are the distinct aspects of Saturn?
Distinct and conspicuous rings around it.
Q50. How many satellites are there for planet Saturn?
Twenty two.
Q51. What are the prominent satellites of Saturn?
Titan, Janus, Helena.
Q52. What is the name of the Moon of Saturn?
ENCELADUS where giant hydrocarbon lakes have been found on the surface.
Q53. Which is the biggest satellite of Saturn?
Titan - having its own atmosphere.
Q54. What is the diameter of Saturn?
120536 Kms.
Q55. How much time does Saturn take to rotate on its own axis?
10 Hrs and 34 minutes.
Q56. How much time does Saturn take to complete one revolution around Sun?
29 years and 168 days.
Q57. What is "Cassini Division"?
Gap in Saturn's rings. It is about 500000 miles in circumference and about 1 foot thick.
Q58. What are the names of the gaps in Saturn and they are also the names of?
Wheeler, Huygens, Cassini and Maxwell. They are also the names of famous astronomers.
Q59. What is the order of planet Uranus from the Sun?
7th - 2870972200 Kms from the Sun.
Q60. When and who discovered Uranus and what is unique about its discovery?
1781 - William Herschell of UK discovered it for the first time by the use of a telescope.
Q61. How much time does Uranus take to complete one circle around the Sun?
84 Terrestrial years. (84 years and 4 days)
Q62. Since its discovery in 1781, Uranus has completed how many circles around the Sun?
Two.
Q63. How many satellites are there for Uranus?
Twelve. All of them are named after characters of William Shakespeare's works or Alexander Pope's poem "The Rape of Lock".
Q64. What are the prominent satellites of planet Uranus?
Miranda, Ariel, Umbrel, Titania, Oberon, Desdemona, Puck, Juliet, Arid etc.
Q65. How much time does Uranus take to rotate on its own axis?
17 Hours and 17 minutes.
Q66. Which planet is 8th in the order of planets?
Neptune.
Q67. Who discovered the planet Neptune?
J.G.Galle of Berlin, Germany in 1846.
Q68. What is unique about the discovery of planet Neptune?
It was the first planet to be discovered by mathematical calculations rather than regular observation.
Q69. When viewed through a telescope, how does the planet Neptune look like?
Greenish Star.
Q70. How many satellites are there for Neptune?
Eight.
Q71. What are the prominent satellites of Neptune?
Triton and Nereid.
Q72. Neptune is named after which Roman God?
God of Sea.
Q73. What is the unique physical feature of Neptune?
The Great Dark Spot. A coud of Methane, as big as the Earth can be found in Neptune.
Q74. What is the diameter of Neptune?
49522 Kms.
Q75. How much time does Neptune take to rotate on its own axis?
16 Hrs and 7 minutes.
Q76. How much time does Neptune take to complete one revolution around Sun?
164 years and 298 days. Has not completed one orbit so far and may not till 2011.
Q77. When was six new satellites discovered for Neptune?
August 1989. US Space prober Voyager I and II discovered the six new satellites around Neptune thus making it eight in all.
Q78. When and who discovered PLUTO?
C.W.Tombaugh of USA in 1930. It is about 591352000 Kms from the Sun.
Q79. While Tombaugh discovered PLUTO somebody else named it. Who is that?
Venetia Burney a school girl from UK.
Q80. How much time does PLUTO take to rotate on its own axis?
247.7 Years (247 years and 256 days)
Q81. How many moons does Pluto have?
One - CHARON.
Q82. When was Pluto declassified from planethood and which body?
On 24th August 2006 by International Astronomical Union.
Q83. When did Pluto crossed the path of Neptune last and when it is expected to reoccur?
January 23,1979 and remained so till March 15,1979. It is expected to reoccur after 222 years.
Q84. After reclassification as dwarf planet by the International Astronomical Union, what name was given to Pluto?
134340
PLANETS AND THEIR MASS:
| 1. Mercury: |
0.33 X 10 ^ 24 Kg |
| 2. Venus: |
4.87 X 10 ^ 24 Kg |
| 3. Earth: |
5.98 X 10 ^ 24 Kg |
| 4. Mars: |
0.65 X 10 ^ 24 Kg |
| 5. Jupiter: |
1900 X 10 ^ 24 Kg |
| 6. Saturn: |
570 X 10 ^ 24 Kg |
| 7. Uranus: |
87 X 10 ^ 24 Kg |
| 8. Neptune: |
100 X 10 ^ 24 Kg |
| 9. Pluto: |
0.7 X 10 ^ 24 Kg |
