Slight problem with habitability figure
Yes, our local star (Sun, Sol, Helios, whatever) will burn out in about 5Bilion years, however, as our star ages, it's getting hotter. The surface our dear little mudspeck will be a boiling dirt ball in about 500,000 years. The atmosphere will be long gone with all the water, the surface will then start to look like it did 4.5 billion years ago, molten. As a species (if H. Sapiens even exists that long) should have completely departed this planet by no later than 100,000 years from now. The equatorial regions will be the first to dry out, the rest a short time later. Better book it for Proxima with the next 10,000 years just to be on the safe side. Oh, yeh, I'm 65, so I ain't worry my head about it.
Biting the hand that feeds IT
