A mysterious Russian satellite with a shady mission has broken apart in Earth's orbit, creating a hazardous cloud of debris zipping around the planet and menacing other satellites, US Space Force announced. The 18th Space Defense Squadron said on Twitter Monday that it had confirmed a satellite called Kosmos 2499 had broken apart into 85 pieces. Previous collisions and satellite break-ups have created far larger and more hazardous debris fields than this. But the pieces of Kosmos 2499 are orbiting at an altitude of about 745 miles — so high that they'll probably be there for a century or longer...