For anybody else wondering, "TRL" is NASA's Technology Readiness Level, ranging from TRL 1 (pie in the sky) to TRL 9 (flight proven mission operations). https:

For anybody else wondering, "TRL" is NASA's Technology Readiness Level, ranging from TRL 1 (pie in the sky) to TRL 9 (flight proven mission operations). https://www.nasa.gov/directorates/somd/space-communications-navigation-program/technology-readiness-levels/ https://www.nasa.gov/directorates/somd/space-communications-...