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Essay/Project Report Sun - Introduction
The Sun was born about 4500 millions years ago out of a large cloud of gas and solid grains of dust condensed into a cluster of stars. The sun was one of these stars indeed. It had a disc was revolving round the sun. Later on, the nine solid bodies took off the disc and shot away. But the sun's gravity (pull) did not let them be all-free. So they began to revolve round the sun speared along fixed paths (orbits). As for the distance, each of the nine bodies was at a different distance from the sun. The sun is a medium-sized star. It a ball made up of not gases-mostly hydrogen. It is very, big in size having a diameter of 1992 thousands kilometres - 1100 times the diameter of the earth. It has a surface temperature of about 60000C. But at its centre, the temperature is about 15 million 0C because nuclear reactions are always going on there. These reactions keep the sun shining and it emits light and heat in all directions.
The sun was born about 4500 million years ago out of the huge dark gas cloud in one of the arms of the Milky way. Several other stars like the sun might have been formed at that time. But we cannot see them as they are far, far away from US. Our sun is the nearest star to the earth.
The sun has been losing its energy in the forms of heat and light. It has been through nearly half its life and the energy left with it is enough to keep it shining steadily for another 5000 million years. Compared to other stars, the sun is smaller and dimmer. But as it is only 150 million kilometers away from US. it looks large and bright. Only a small part of the sun's energy reaches our earth It is due to this energy that the earth is a livable planet, with various living things on it. The sun is roughly round in shape and has spots on it. These areas are comparatively coaler than other areas. So, they look as spots on the face of the sun.
(They are called sun-spots)
Judge streamers of growing gas leap up from the sun's surface. They are like flames and are called prominences. Some of them curve to make are of five. More over, atomic particles shoot in all directions from the sun at the speed of a bullet. They spread out very thinly. They are called solar wind which blows beyond Neptune even. The sun has three layers :
(i) Photosphere :-
The shining surface that we see from the earth.
(ii) Chromospheres :-
A layer some thousands Km. below the photosphere.
(iii) Corona :-
The atmosphere that stretenes millions of Km. around it.
The Sun family six of the planets- Mercury, Venus, Mars, Jupiter, Saturn and Uranus are bright enough to be seen with the naked eye while the remaining three are visible thought a telescope only. Also, there are millions of smaller bodies in the space through which the planets revolve (morel) They are moons, asteroids, comets, meteors and meteorites. All these bigger and smaller bodies make the Suns family.