On the timescale of hundreds of millions of years the sun is increasing in luminosity, and may one day render the Earth uninhabitable. Is it possible to envisage a way to move the entire planet further from the Sun to prevent this fate? David Brin: Let's Lift The Earth http://davidbrin.blogspot.com/2014/11/lets-lift-earth.html The Wandering Earth https://en.wikipedia.org/wiki/The_Wandering_Earth Astronomical engineering: a strategy for modifying planetary orbits https://arxiv.org/pdf/astro-ph/0102126.pdf