Composition of the Solar System
Answer Text: Composition of the Solar System 1. The Sun It’s the centre of the universe. Characteristics • It’s a star. A star is a heavenly body possessing its own light which it transmits. Nebula/galaxy is a cluster of stars. The earth is in a galaxy called The Milky Way.• It’s made of very hot gases mainly hydrogen (70%) and helium (30%). • Has a diameter of 1392000km. • Surrounded by a layer of gas which has boiled from its surface which is called corona. • Rotates on its own axis in anticlockwise direction. • Has gravitational pull which holds all the planets in orbit around it.An orbit is a path which a planet or a satellite follows around a star or a planet. • Temperature at its centre is 15m◦c and at the surface is 5500◦c. • Radiates solar energy which is very important for all forms of life on the earth.
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