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Write a note on Sun .
 The Sun is a star. The reason it looks so big and bright as compared
with the stars in the night sky is that it is very close to the Earth. If
the distance from the Sun to Earth (about 150 million km; or about 93
million miles) is scaled to about 15 m (45 ft), the nearest star to the Sun
would be located over 4,000 km (2,490 miles) away. That is, if the Sun
and the Earth were located in Washington, D.C., the nearest star to the
Sun would be in California. Most stars that we see are much further
away from the Earth; this is why they look so small in the night sky,
even if they are similar to the Sun.
The Sun is at the center of the Solar System. The planets, asteroids
and comets all revolve around the Sun. The Sun’s role as the center
of the planetary system comes from its high mass; it has 99.8% of the
mass in the Solar System and, therefore, guides the movement of the
other objects via gravitational forces. The light emitted by the Sun
brings energy to the rest of the Solar System and largely dictates the
temperatures on the planets.


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