QUESTION:
How many and what are the different instruments that HST has got (e.g.: a
spectrometer, etc...)?

Answer from Jeffrey Hayes on April 15, 1996:
Hello,
Currently on HST there are 5 science instruments: The Wide-Field and
Planetary Camera 2 (WFPC2) for imaging; the Faint Object Camera (FOS) which
uses different types of detectors to image faint objects; the Goddard High
Resolution Spectrograph (GHRS) which is used for looking at bright star
in great detail; the Faint Object Spectrograph (FOS) to look a faint stars
and galaxies in low detail; and Fine Guidance Sensors (FGS) to measure the
positions of stars very accurately.  In 1997 the 2 spectrographs will be
replaced by 2 new instruments that will concentrate on the infra-red part
of the spectrum.