Driving on the freeway on a particularly warm day in California with the sunroof tilted up. Heard a explosion and glass fell on top of me and my family. We pulled over to see what had happened because we didn’t see any objects flying at us. Upon inspection of the vehicle we noticed that the sunroof had imploded. The glass didn’t shatter all the way it looked as if something had been thrown from inside up and out of the sunroof window. A hole was blown out of it. I believe the panoramic shape of the window causes there to be a weak point in the center. Given that weak point and the weather that day it was hot outside and the sunroof was tilted upright the wind coming into the car from the sunroof and probably exiting as well may have caused a reaction between the hot weather and the cool air and imploded the window from inside the car out.