“I would argue that in any habitable zone that doesn’t boil or freeze, intelligent life is going to emerge because intelligence is convergent.” -Simon Conway Morris
Someday, in the far distant future, the evolution of the Sun will cause it to heat up and emit so much energy that the Earth’s surface will reach a terrible threshold: 100 degrees Celsius (212 degrees Fahrenheit). When this happens, the oceans will boil away, rendering the surface completely uninhabitable and inhospitable to even the most extreme known forms of life.
While there are many potential solutions, perhaps the most intriguing is to migrate the entire planet farther away, buying our world additional billions of years of potential habitability. However, the energy costs are huge, and the amount of power required is much larger than anything humanity has ever known. Is it physically possible? Yes. But from a practical perspective? There are, shall we say, challenges.