Quote:
Originally Posted by Kunama
Amazing ............. here I was under the impression that the Sun would not exit the main sequence for another 5 billion years and begin its transformation into the RGB and thereby expand to an overall diameter of 2 AU. We better get a move on if our time limit has just been cut to a 10th. I would think that Mars which will them be only 78 million klms from the Sun mights be a tad warm as well.
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You don't need to wait for the Sun to blow up that much. It is gradually getting hotter without growing much bigger. Well before Earth gets swallowed it will be too hot to support life as we know it.