TID

total ionizing dose

TPS

thermal protection system

TRL

technical readiness level


ULF

utilization and logistics flight

USAF

U.S. Air Force

UV

ultraviolet

UVis

ultraviolet-visible


VIK

voltage improvement kit

VLT

Very Large Telescope (of the European Southern Observatory)


WESTAR

communications satellite originally built by Western Union

WFC3

Wide-field Camera 3

WFPC

Wide Field Planetary Camera


XSS-11

experimental satellite system (for USAF)



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