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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The 250 million to 500 million year figure came from an S&T article from years ago, which was saying that most people mistakenly think that the earth will be around for the lifetime of the sun, but that as the sun gets older it will make life too warm on earth much, much earlier than that.
Regards,
Renato