Subject: General Knowledge and IQ
The Solar System is the Sun and all the objects in orbit around it. The Sun is orbited by planets, asteroids,comets and other things.The Sun is a star. It contains 99.9 percent of the Solar System's mass. This means that it has strong gravity. The other objects are pulled into orbit around the Sun. The velocity of the solar system is about 5000 km/sec. The sun is the largest and main star in solar system.The size of the solar system is 79.5 Au. There are 8 planets in the solar system. They are- Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune. There are 67 satellites in our solar system. In, 1543 A.D it was discovered that the earth and other planets revolve around the sun. Nicolas Copernicus discovered the fact that the sun is in the centre of solar system but not the earth. He belongs from Poland. Sun is the centre of solar system.
Heavenly bodies which revolve around in its elliptical paths are called orbit. In solar system, the asteroids belt lie between the orbits of Mars and Jupiter. Solar system takes One cosmic year to revolve around galactic centre.
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