Researchers have helped unravel the mystery of why certain pairs of stars pulse with regular, long-period bursts of radio waves. The particular class of objects they observed come in pairs that always include a compact dead star, called a white dwarf, loc

Directed-energy and cyber weapons, as well as bombs targeted on communications hubs, all have potential to disable large satellite constellations, said Lt. Gen. Rick Zellmann, deputy commander of US Space Command.