astronautical
or as·tro·nau·tic
[ as-truh-naw-ti-kuh l, -not-i- or as-truh-naw-tik, -not-ik ]
/ ˌæs trəˈnɔ tɪ kəl, -ˈnɒt ɪ- or ˌæs trəˈnɔ tɪk, -ˈnɒt ɪk /
adjective
of or relating to astronautics or astronauts.