It all had a beginning in the original cosmic explosion, whatever that was, and it'll all have an end when all the stars run down. Some run down fast… - Isaac Asimov

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It all had a beginning in the original cosmic explosion, whatever that was, and it'll all have an end when all the stars run down. Some run down faster than others. Hell, the giants won't last a hundred million years. The sun will last ten billion years and maybe the dwarfs will last two hundred billion for all the good they are. But just give us a trillion years and everything will be dark. Entropy has to increase to maximum, that's all. (Lupov)