KENNEDY SPACE CENTER — The weather was looking good as SpaceX launched more than 20 Starlink satellites on Tuesday night. Taking off from Launch Complex 39A at the Kennedy Space Center at 11:41 p.m. ET, SpaceX stated that its Falcon 9 rocket took Starlink 6-76 mission into the deep black.

Scientists are raising alarms about SpaceX’s Starlink satellites, and it’s not just about the night sky. With over 5,000 satellites in orbit—and thousands more planned—experts are now worried about the potential damage to Earth’s atmosphere.