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the sun and the stars

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[pic] Life here on earth would be impossible without the sun. The heat from it keeps the temperature up, so life can exist. The vegetation on this planet uses the light to get the energy to grow in a process called the photosynthesis. The sun itself is a glowing ball of gas, with a diameter of 1 392 000 km. It is as big as if you would put 109 earths ...