Lots of stuff: https://nodis3.gsfc.nasa.gov/displayDir.cfm?t=NPR&c=8705&s=2C https://nodis3.gsfc.nasa.gov/displayDir.cfm?t=NPR&c=8705&s=2... But even if you d

Lots of stuff: https://nodis3.gsfc.nasa.gov/displayDir.cfm?t=NPR&c=8705&s=2C https://nodis3.gsfc.nasa.gov/displayDir.cfm?t=NPR&c=8705&s=2... But even if you design to those standards, doesn't mean you will actually get certified. And as SpaceX learned, the interpretation of those specification are not easy. So if you just build something without constantly working with NASA, and have their cooperation, you are unlikely to get certified.