I was thinking to myself that I absolutely can’t grasp the concept of space distances. I saw a picture of a comet with a tail that was 18 light years long. Give me the number in millions of miles, my mouth would start to foam and I’d twitch. Nevermind the number, trying to grasp how long it would be... I absolutely love astronomy and space, but just cannot for the life of me grasp those distances.
18 light years = 105 742 830 121 331.4 miles
No, I did not figure this out myself, and used the computer.