Speaking from personal experience, zlib and libjpeg are almost certainly running on satellites in space right now. Dependencies like this are often vendored and

Speaking from personal experience, zlib and libjpeg are almost certainly running on satellites in space right now. Dependencies like this are often vendored and seldom updated though, so your contributions may take a while to actually make it into a flight software codebase. You may also never receive direct notice that your code is in use, especially if it gets used in a defense-related project.