ESA

European Space Agency

ESM

Electronic Support Module

ESTR

Engineering Science Tape Recorder

ET

external tank

ETS

Engineering Test Satellite

EVA

extravehicular activity

FGS

fine-guidance sensor

FOC

Faint Object Camera

FOS

Faint Object Spectrograph

FUSE

Far-Ultraviolet Spectrographic Explorer

GA

grapple arm

GALEX

Galaxy Evolution Explorer

GHRS

Goddard High Resolution Spectrograph

GN&C

guidance, navigation, and control

GSFC

Goddard Space Flight Center

HRSDM

Hubble Robotic Servicing and Disposal Mission

HRV

Hubble Rescue Vehicle

HST

Hubble Space Telescope

INTELSAT

International Telecommunications Satellite

IR

infrared

ISS

International Space Station

ITVC

integrated television camera

JDEM

Joint Dark Energy Mission

JPL

Jet Propulsion Laboratory

JSC

Johnson Space Center

JWST

James Webb Space Telescope

KSC

Kennedy Space Center

LED

light-emitting diode

LF

logistics flight

LMSC

Lockheed Missiles and Space Company

MER

Mars Exploratory Rover

MLI

multi-layer insulation

MMOD

micro-meteoroid orbital debris

MSFC

Marshall Space Flight Center

MSS

Magnetic Sensing System

MTBF

mean time before failure

MTTF

mean time to failure