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Stars are huge balls of burning gas that are scattered throughout the Universe. They bum for millions of years, giving off both light and heat. Stars produce energy by a process called nuclear fusion. The coolest stars are red and dim, while the hottest stars give off blue-white light.
The temperatures on the surface range from 3,500°C for cooler stars to over 40,000°C for the hottest stars.
A new star is born when gas and dust are drawn together by gravity, forming a huge clump. It heats u
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Tags: universe,
gas,
energy
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