Add Yahoo as a preferred source to see more of our stories on Google. (cokada/iStock/Getty Images) Alien megastructures built to harvest stellar energy or alter the orbits of stars may be physically ...

The curious minds at What If explore the awe-inspiring engineering and gargantuan proportions of space megastructures like Dyson spheres and O'Neill cylinders that challenge our understanding of the ...

A rendering of a potential Dyson sphere, named after Freeman A. Dyson. As proposed by the physicist and astromomer decades ago, they would collect solar energy on a solar system wide scale for highly ...