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Old 02-16-2019, 08:47 AM   #5
AlexanderHowl
 
Join Date: Feb 2016
Default Re: Shielding Earth/Moving Earth from Suns Red Giant phase.

Earth would never be swallowed during the red giant phase, Sol is too tiny, though its blackbody T would increase to 700 K. For it to remaining habitable, it would have to move to 6.25 AU. Since we have 7.1 billion years until the beginning of the phase though, we have plenty of time, as moving the Earth 53 meters per year would do it.

I would suggest using Vesta, as it is relatively solid, and could be maneuvered without that much difficulty. A gravity tractor in the position of Earth-Sol L2 could probably do it. Another alternative would be to use the Moon, as moving its orbit would move the orbit of the Earth.

Last edited by AlexanderHowl; 02-16-2019 at 02:19 PM. Reason: Corrected due to math error
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