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- The solar system consists of sun, the nine planets and their satellites and thousands of other smaller heavenly bodies such as asteroids, comets and meteors.
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- The sun is a star of intermediate size and luminosity.
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- The sun appears to be larger and brighter than other stars because it is nearer to the earth than any other star.
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- There are nine planets, which revolve round the sun in closed elliptical paths.
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- Asteroids are very small planets of rock and metal, which revolve round the sun mainly between the orbits of Mars and Jupiter.
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- A comet is a collection of gas and dust, which appears as a bright ball of light in the sky with a long glowing tail.
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- Meteors are the heavenly bodies from the sky, which we see as bright streaks of light that flash for a moment across the sky.
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- The earth is a huge sphere, the surface of which is made up of rock, soil and water and is surrounded by air.
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- The earth consists of three major layers, which are the crust, mantle and core.
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- The outermost layer of earth is called crust.
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- The central region between the crust and core of the earth is called mantle.
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- The innermost part of earth is called its core.
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- A star is made up mainly of two gases namely hydrogen and helium.
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- The stars, which appear in the form of closed groups and form recognizable shapes and patterns are known as constellations.
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- A galaxy is a congregation of billions of stars held together by gravity.
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- Our galaxy is the Milky Way galaxy, which is a spiral galaxy.
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- The vast surrounding space is called universe, which includes everything that is existing.
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