Quote Originally Posted by Papewaio View Post
Given the mass of the sun it is a matter of when not if. Earth will probably be swallowed up in five billion years.

However the sun will start out putting more energy in about a billion years ... Which is when life on earth will start to be in danger.
I think start to be in danger is putting it mildly isn't it, what with the water and atmosphere being boiled off

The timelines do put things in perspective in terms of development of intelligent life, given that it's taken about 3/4 of the period the planet will be habitable for to get as far as us...