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SOLAR SYSTEM
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Posted By: sobha wilson Member Level: Gold Points/Cash: 7
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SOLAR SYSTEM
The Solar System consists of the Sun, the nine planets and their moons, asteroids, comets, meteoroids and other debris. The Sun holds all these objects in fixed orbits by its strong gravitational pull. The Sun makes up 99% of the Solar System’s mass. Most of the Solar System is a vast empty space.
The study of the nine planets is necessary for the study of the Solar System.
Mercury:
Mercury is the smallest planet of the Solar System and nearest to the Sun. it takes 87.97 Earth-days to complete one revolution round the Sun, but 59 days to complete one rotation on its own axis. It is difficult to see it very clearly because of its extreme proximity to the Sun. However, studies reveal that there are many hills on its surface. There is no water on this planet. Its distance from the Sun is 57.9 million km s.
Venus:
Venus is the planet nearest to the Earth. Its distance from the Sun is 108.2 million km. It has approximately the same size and weight as that of the Earth. It takes 1.88 Earth-years to complete one revolution round the Sun and 243 days and 14 minutes to complete one rotation on its own axis. It has some atmosphere. Man sent a spacecraft to this planet.
Earth:
Earth is the only planet of the Solar System that is inhabited by living beings. Its distance from the Sun is 149.6 million km. It take 365.26 days to complete one revolution on its own axis, it takes 23 hours and 56 minutes. The moon is the only satellite of the Earth and resolves round it.
Mars:
Mars is red in appearance. Besides the earth, this is the only planet where signs of vegetation are found. Studies have revealed that it has mounts of ice on its poles. Its distance from the Sun is 227.9 million km. It takes about 686.9 days to make one revolution round the Sun. On its own axis, it makes one rotation in 24 hours and 37 minutes. It has 2 small moons- Phogos and Diamos.
Jupiter:
Jupiter is the biggest planet of the solar family. Its distance from the sun is 778.3 million km. It completes one revolution round the sun in 11.86 years, whereas it makes one rotation on is own axis in 9 hours and 55 minutes. It is 317.94 times heavier than the earth. Being at a great distance from the sun, it is an extremely cold planet. It has altogether 16 moons.
Saturn:
Saturn is a peculiar planet of the solar system. Its distance from the sun is 1,427 million km. It takes 29.46 earth-years to complete one revolution round the sun, but only 10 hours and 40 minutes to make one rotation on its own axis. There are many rings around it. It has 18 moons.
Uranus:
Uranus completes one revolution round the sun in 84.01 years. But it takes 17 hours and 14 minutes to make one rotation on its own axis. Its distance from the sun is 2,871 million km. It has 15 moons and has 11 rings that consist of rocks interspersed with dust lanes.
Neptune:
Neptune takes 164.79 earth-years in making one revolution round the sun. It completes one rotation on its own axis in about 16 hours and 7 minutes. Its distance from the sun is 4496 million km. It has 8 moons and 4 tenuous rings.
Pluto:
Pluto is the farthest planet from the sun. It completes one revolution of the sun is 248.54 years. On its own axis it takes 153 hours to complete one rotation. Its distance from the sun is 5,900 million km. It has one moon, which is half the size of Pluto, called Charon.
In additional to these planets, there are about 1,700 asteroids, which also revolve round the sun. They lie between Mars and Jupiter. They are, in fact, small pieces broken away from the bigger planets and since have been revolving round the sun.
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| Author: peregrina patro | Member Level: Silver | Revenue Score:  | We have only eight planets.
Pluto has been demoted as a planet because it does not dominate its neighbourhood.
Charon,its large 'moon' is only about half the size of Pluto, while all true planets are far larger than their moons.
The orbit of Pluto is highly eccentric. At times it is closer to the Sun that Neptune ( as it was from January 1979 thru February 11 1999). Pluto also rotates in the opposite direction from most of the other planets.
| | Author: sherly | Member Level: Silver | Revenue Score: | Good Submission
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