technically you have a point. The DPI needed would be really low seeing as the viewing distance is kinda far from here to the moon.
I just did the math the moon is 68365440 inches across
My image is 18916 dots across so dechnically the DPI would be .000276dpi
IS THAT ACCEPTABLE?
Here's a resource for what DPI is acceptable
http://resources.printhandbook.com/pages/viewing-distance-dpi.php
at 2ft viewing distance 300DPI is the minimum
At 650ft 1dpi is the minimum
I'm guessing that the moon at 238k miles I'm guessing .0002 is plenty acceptable DPI
Actually I did some math and I'm thinking that 332k FEET is probably the distance where .0002 is the necessary distance for viewing.
Keep in mind this means each dot on said printer for this moon print would be 3600 inches large aka 301ft
So what I'm reading is that we need to have Elon Musk buy your photo and then he can print it (at a truly acceptable DPI) so that everyone can see it.
But really, I'm impressed at your thoroughness, haha. Your photo is basically 5x the necessary resolution. Not bad..
What I'm reading is that @jarvie has a lot of free time. ;D