In this dark future, we might build enormous space power plants around black holes, lowering masses toward them to harvest their gravitational pull “like the weights pulling down in a grandfather’s clock,” says Princeton physicist J. Richard Gott. Or we might tap the internal heat of planets to generate energy: The gravitational interaction between celestial bodies creates friction, which can keep planets hot inside even without any starshine.
Don’t picture cave dwellers huddling around geothermal heaters. Trillions of years of evolution will have long since transformed us ... Read even more
