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Competitive Examination Notes - 006

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The Sun - 01
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The Sun, closest star to Earth is a huge mass of hot, glowing gas. The strong gravitational pull of the Sun holds Earth and the other planets in the solar system in orbit. The Sun's light and heat influence all of the objects in the solar system and allow life to exist on Earth. Of all the heavenly bodies, Sun is the most dependable and it was most reassuring for the early sky watchers.

The Sun occupies a unique and vital position in our day-today life. Life on earth would not be possible without Sun. Perhaps the most astonishing thing scientists have discovered about the Sun is that it is quite ordinary. There is no reason to think that the gases and elements that are building blocks of Sun and its planets could not behave in a similar way again during star formation. Other stars also have planetary systems and about 1,000 extra solar planets were discovered in the past 10 years. The Sun is about 150 million kilometers from the Earth. Compared to stars, the planets are tiny and hard to see.
Sun is termed as a G2 V star, with G2 standing for the second hottest stars of the yellow G class (of surface temperature about 5,800 Kelvin) and the V representing a main sequence, or dwarf star, the typical star for this temperature class. (G stars are so called because the prominence of a band of atomic and molecular spectral lines that the German physicist Joseph von Fraunhofer designated G) The Sun exists in the outer part of the Milky Way Galaxy was formed from material that had been processed inside a supernova. The Sun is not, as is often said, a small star. Although it falls midway between the biggest and smallest stars of its type, there are so many dwarf stars that the Sun falls in the top 5 percent of stars in the neighbourhood that immediately surrounds it
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