A large well defined object passed in-front of the brightly lit full moon; crossing across the right lower quadrant

Driving on the interstate my son exclaimed “what is that?”, looking automatically at the moon while driving I witnessed a large linear slightly convex shape in the 6 o'clock position going over to the 4 o'clock position of the moon. It was one solid object that quickly moved towards the right side if the moon, as if it was passing infront of the moon. It lasted approximately 10 seconds to leave visibility, as it was a clear dark night without clouds. My son shared with me he witnessed it more of a large cigar shape. Defined edges. No lights or other abnormalities. It was huge to be able to black out such a large portion of the moons light.