.title
High Resolution Spectrograph
.description
An instrument capable of obtaining the ultraviolet spectra of individual
objects in crowded fields.
.contents
     The High Resolution Spectrograph .~ (fig. 3)~ will be able to use
the full resolving capability of the .~ telescope~ to see much dimmer
objects than previous space-born instruments.  Although it performs in
much the same way as the .~ Faint Object Spectrograph~, it will be much
more accurate because it will be using more light and resolving it into
much finer increments.

     The High Resolution Spectrograph will be looking at only the
ultraviolet region of the spectrum, wavelengths that do not reach Earth.
 This ultraviolet region should provide the most detailed chemical
composition information yet obtained on objects in space.

     The instrument's extremely fine resolution will enable it to pick
out individual stars in crowded fields.  In addition, binary stars that
cannot be differentiated optically will be resolved so that each star
can be studied separately.

     The .~ spectrograph~ will be able to study such objects as supernovae,
active galaxies, bright quasars, and even phenomena in our
own solar system such as planetary atmospheres, auroral activity, and the
presence of deuterium in comets.  Deuterium, thought to have been
manufactured during the Big Bang, occurs throughout the universe.  If
found in comets, it will reveal more about the relation of our solar
system to the original cataclysmic explosion.