Sure… Until he takes his private jet out of the United States of America and has to register the information with a non USA equivalent of the FAA

The moon is roughly 385 megameters away, or 0.4 gigameters!

Do we use MM for megameters and mm for millimeters? i think this might start to get confusing. We should probably clarify a few things before some tradie apprentice builds the galaxy’s largest bookshelf.