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Write a note on Solar system ?
The Sun, together with the planets and moons, comets, asteroids, meteoroid
streams and interplanetary medium held captive by the Sun’s gravitational
attraction. The solar system is presumed to have formed from a rotating disc of
gas and dust created around the Sun as it contracted to form a star, about five
billion years ago. The planets and asteroids all travel around the Sun in the
same direction as the Earth, in orbits close to the plane of the Earth’s orbit and
the Sun’s equator. The planetary orbits lie within 40 astronomical units
(6 thousand million kilometres) of the Sun, though the Sun’s sphere of
gravitational influence can be considered to be much greater. Comets seen in
the inner solar system may originate in the Oort cloud, many thousands of
astronomical units away.


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