SpaceDyson spheres: How to spot an alien megastructure Intelligent extraterrestrials may have built vast solar power plants around their host stars. The hunt for their telltale glow is hotting up Features
HumansYou are stardust: The long view of when your existence really began The point when you began depends on the scale you look at and how you define a person – in one sense you’re as old as the universe, in another you’ve hardly begun at all Features