This coaster depicts the logo of the US National Aeronautics & Space Administration, otherwise known of course as NASA. Buy one of these and trigger the flat-earther in your life!
If you don't have a 3D Printer and you want one of these coasters please send me a DM and we can arrange for me to print one for you :)
Also check out my Etsy store - www.etsy.com/uk/shop/enterprisexddesign