With almost ten thousand Starlink satellites in orbit, Elon Musk's SpaceX leads in a new space race. But as more players race to launch satellite megaconstellations of their own, scientists are raising the alarm about the rising risks of having so many in orbit – and what happens when they plummet back to Earth. As Darius Mahdavi reports, the risk of a fatality from falling space debris has climbed dramatically, even as experts find new ways to track re-entries. »»» Subscribe to CBC News to