A reference section defining acronyms and abbreviations used throughout the Chandra X-ray Observatory Web site and also on the PASSPORT TO KNOWLEDGE passporttoknowledge/universe site.

ACIS -  Advanced CCD Imaging Spectrometer
ASCA -  also known as Asuka, Advanced Satellite for Cosmology & Astrophysics, Japanese X-ray satellite
AXAF -  Advanced X-ray Astrophysics Facility
CFA -  or CfA Center for Astrophysics (Harvard Smithsonian)
Co-I -  Co-Investigator
CXO -  Chandra X-ray Observatory
CXC -  Chandra X-ray Center
DSN -  Deep Space Network
FOV -  Field of View
GMT -  Greenwich Mean Time
GRO -  Compton Gamma Ray Observatory
GSFC -  Goddard Space Flight Center
GTO -  Guaranteed Time Observer
HEASARC -  High Energy Astrophysics Science Archive Research Center
HETG -  High Energy Transmission Grating
HQ -  Headquarters
HRC -  High Resolution Camera
HRMA -  High Resolution Mirror Assembly
HST -  Hubble Space Telescope
IRAS -  Infrared Astronomical Satellite
ISAS -  Institute of Space and Astronautical Science
IUS -  Inertial Upper Stage
JPL -  Jet Propulsion Laboratory
KSC -  Kennedy Spaceflight Center
LETG -  Low Energy Transmission Grating
LETGS -  LETG Spectrometer
MEG -  Medium Energy Grating
MIT -  Massachusetts Institute of Technology
MSFC -  Marshall Space Flight Center
NASA -  National Aeronautics and Space Administration
NGC -  New General Catalogue
NGST -  Next Generation Space Telescope
NRAO -  National Radio Astronomy Observatory
OCC -  Operations Control Center
PI -  Principal Investigator
PST -  Pacific Standard Time
ROSAT -  Roentgen Satellite
RXTE -  Rossi X-ray Timing Explorer
SAO -  Smithsonian Astrophysical Observatory
SIM -  Scientific Instrument Module
SNR -  Supernova Remnant
SOHO -  Solar and Heliospheric Observatory
SOP -  Standard Operating Procedure
STSCI -  Space Telescope Science Institute
TBD -  To Be Determined
UV -  Ultraviolet
VLA -  Very Large Array
WWW -  World-Wide Web
XMM -  High Throughput X-ray Spectroscopy
XRS -  X-ray Spectrometer
XUV -  Extreme Ultraviolet