As we humans grow in numbers and technological sophistication, we will need to generate more and more energy for our use. That likely means ever more reliance on renewable sources of energy like ...

Dyson spheres, the hypothetical mega-structures that advanced alien civilizations might use to enclose a star and harness its energy, suffer from a fatal flaw: They are catastrophically unstable.

This sphere would enclose a star, providing billions of planets' worth of surface area and capturing vast amounts of solar energy. Dyson calculated that a shell made from a planet with the mass of ...

This sphere would enclose a star, providing billions of planets' worth of surface area and capturing vast amounts of solar energy. Dyson calculated that a shell made from a planet with the mass of ...