Car was traveling at about 60 miles per hour on a flat road at 5:30 pm when a loud bang was heard. we noticed that the sunroof has completely shattered, but stayed intact. small shards of of glass fell inside. the temperature was 55 degrees fahrenheit outside and 69 inside. we closed the cover so no glass would fall inside. the sunroof does not look like anything hit it and the vehicle is stored in the garage.