  An 8 m successor to the Hubble Space Telescope (HST) would make incredible
gains in the study of stellar populations, especially in the Local Group. If
diffraction-limited at 0.5 microns, the "Next HST" could produce
high-resolution imaging of faint sources over a wide field in 1 percent of the
time needed with the HST. With these capabilities, photometry of the ancient
main sequence could be obtained for many sight-lines through Local Group
galaxies, thus determining directly the ages of their structures and providing
a formation history for the Local Group populations.
