When the Sun erupted in November, it sent charged particles cascading into Earth's atmosphere and quietly moved the ground beneath self-driving cars — not physically, but in the only way that matters to a machine navigating by satellite: it moved where the car believed itself to be, by more than 33 feet. Researchers documenting the event in Geophysical Research Letters revealed that solar storms can reshape the upper atmosphere in ways that corrupt GPS timing, exposing a profound dependency at the heart of autonomous transportation and precision agriculture. The disruption lasted only hours, b