Planets

Planets

1) A planet does not emit light of its own.
2) A planet does not twinkle at night.
3) The planets of our solar system are nine in number.
4) The planets are very small in size as compared to stars or sun.
5) The relative position of the planets keeps on changing day by day.
6) Most of planate move around the sun.
7) The temperature of planet depends upon its distance from sun.
8) The planets is made of rocks and metals.

Mercury( Budha )

1) It is the closest planate to the sun.\It lies between the sun and earth.
2) It is the hottest planate of the solar system.
3) It moves around the sun from west to east.
4) There is no water and atmosphere.
5) It does not have any satellite.
6) The life is not possible on the planate.
7) Its mean diameter is 4820 km and its mass is 3.35 ×1023 kg.
8) It completes one revolution around the sun in 88 days.
9) It is an inferior planet.

Venus (Sukra)

1) It is the brightest planate of the solar system.
2) It is also known as morning star and evening star.
3) It is a second planate of the solar system next to the mercury in order of increasing distance from the sun.
4) It is also called earth’s sister.
5) The one side of Venus is always facing the sun and its surface temperature is 450°C.
6) It can be seen with naked eye.
7) It does not possess any satellite.
8) This planate rotates about its axis from east to west around the sun. This rotation is called retrograde., which is different from other planets.
9) It is covered with a think atmosphere containing 95% carbon dioxide at the pressure about 100 times that on earth?s surface.
10) There is no possibility of life on this planet.
11) Its mean radius is 6.1 ×103 km and period of revolution around the sun is 225 days.
12) It is an inferior planet.

Earth

1) It is the third planate of the solar system in order of increasing distance from the sun.
2) It has one natural satellite called Moon.
3) There is water on the earth and oxygen in the atmosphere of the earth.
4) Life is there on the earth.
5) It rotates about its axis from west to east and completes each rotation in 23h 56 minutes.
6) The radius of earth .

7) Its mean radius is 6.3 ×103 3 km and the mean distance from the sun is 1 A.U. (= 1.496×1011 m).

Mars (Mangal)

1) It is forth planate of the solar system in order of increasing distance from sun.
2) It is nearest planet from the earth.
3) It is reddish planet of the solar system.
4) It can be seen by the nicked eye.
5) It has two moons, called Fobos and Dimos.
6) The atmosphere of mars mainly consists of carbon dioxide.
7) Mars changes color in different seasons.
8) No life has been detected on it.
9) Its radius is 3.4 ×103 km and the time period of the sun is 1.9 year.
10) It rotates from west to east about it axis and complete its rotation in 24h 27 min.
11) It is a superior planate.

Jupiter (Brihaspati)

1) It is the fifth planate of the solar system in order of increasing distance from the sun.
2) It is heaviest and brightest planet of the solar system.
3) It can be seen with naked eye.
4) It has sixteen numbers of satellites.
5) Life is not possible on this planet as its atmosphere has poisonous gases like methane and ammonia.
6) Its radius is 71.4 ×103 km and the time period of revolution around the sun is 11.8 years.
7) It rotates from west to east about it axis and complete its rotation in 210 h 14 min.
8) It is a superior planate.

Uranus ( Indra)

1) It is the seventh planet of the solar system.
2) It is the third largest planet of the solar system.
3) It can be seen with naked eye.
4) Uranus has 15 satellites and a ring.
5) It planate rotates from east to west on its axis and complete each rotation in 10 h 49 min.
6) The radius of his orbit is 23.4 ×103 km period of revolution around the sun is 85 years.
7) It is a superior planate.

Neptune (Varun)

1) It is the eighth planate of the solar system in order of increasing distance from the sun.
2) It is about 17 times heavier than earth.
3) It has 15 satellites.
4) It cannot be seen with naked eye.
5) Its radius is 22.3 ×103 km and period of revolution around the sun is 165 years.
6) It rotates from west to east about its axis and its period of revolution is 15 hours.
7) It is a superior planate.

Pluto (Yama)

1) It is the ninth planate of the solar system in order of increasing distance from the sun.
2) It is the farthest planate from the sun as well as from the earth.
3) It is the coldest planet of the solar system.
4) It cannot be seen with naked eye.
5) It has 1 satellite called Chron.
6) It is the highest planate of the solar system.
7) It is the second smallest planet in size of the solar system.
8) Its radius is 3.2×103 km and period of revolution around the sun is 248 years.
9) It rotates from west to east about its axis and its period of revolution is 6.39 days.
10) It is a superior planate.

Moon

1) It is the natural satellite of our earth.
2) Its distance from our earth is 3.84 ×105 km.
3) It mean diameter is 3480 km and its mass is 7.35 ×1022 kg.
4) The gravity of moon is 1/6th that of earth.
5) Satellite of Pluto is called Charon discovered in 1978 by James Christy.
6) Its period of revolution around earth is 27.3 days.
7) It emit electromagnetic waves in radio region, hence it is called radio moon.
8) It always keeps same face towards the earth.
9) The temperature of the moon during the day is 110°C and at night – 150°C.
10) The surface of moon has craters.
11) There is no atmosphere and water on the moon’s surface.
12) There is no life on the surface of moon.