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They don't. All scientists know is that at some time in the future it is an almost certainty that the world as we know it will come to an end. Our sun will eventually burn out and with no sun there could be no life on our planet. Some scientist predict the sun will blow up in about 3,000,000,000 years the sun will explode and start from a tiny speck again.

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14y ago

What else can I help you with?