Reber read about the sky waves some ten years ago while he was working as a radio engineer in Wheaton, Ill. To eavesdrop on the stars, he built a radio “telescope” in his backyard. It was ...

To detect drones and aim the acoustic beam, the system records sound waves from approaching drones and uses a computer costing around C$30 to crunch data from a sky-scanning camera. Prandtl hopes ...

But few are fortunate enough to see Kelvin-Helmholtz clouds, which look like a pattern of ocean waves in the sky. Kelvin-Helmholtz clouds, also known as fluctus clouds, is a rare phenomenon that's ...