  GALEX has identified large numbers of extra galactic objects that are too
faint to be observed by FUSE. These star forming systems are potential sources
of Lyman continuum (Lyc) radiation and may contribute to the metagalactic
background radiation that ionizes most of the baryons in the universe. By
measuring the level of Lyc radiation leaking from these galaxies we can
quantify the contribution of stars, relative to quasars, to the ionizing
background at low redshift (0.025 <~ z <~ 0.4) and provide insight into the
reionization processes at high redshift. A meter class instrument with a
moderate spectral dispersion, wide-field, multi-object spectrograph can detect
Lyc leak from a statistically significant number of these galaxies, if the
average escape fraction f_{esc} <~ 1%. Such an instrument will have enormous
discovery potential because of the large number of extra-galactic objects that
exist within its grasp. LyContEx will be scientifically productive, synergistic
with existing surveys, and can be developed into a far ultraviolet mission in
the near future.
