After taking off from Cancun, Mexico, on October 30, a packed JetBlue airliner seemed well on its way for just another uneventful flight. But after grounding more than 6,000 of its planes last week, Airbus finally shared the suspected culprit: cosmic rays from outer space messing up the aircraft’s computer systems. Experts have been warning of cosmic rays’ potential to disrupt flight systems for years. Planes are now controlled by electronic computer systems rather than mechanical ones more than ever, exposing more systems to behaving unexpectedly after a bit-flip disruption. More on space: NASA Says Boeing’s Busted Starliner Spacecraft Won’t Be Allowed to Carry Astronauts on Next Mission