Technology challenges for large spacecraft optical systems

The technology challenges posed by future NASA astrophysics missions in the visible region of the spectrum whose goals include making high resolution images of faint objects, and high accuracy measurements of the positions of brighter objects for dynamical studies are discussed. Concentration is on the problems associated with possible next generation great observatories in space in the post-Hubble Space Telescope, particularly those with partially filled apertures. Telescopes using interferometric techniques in the visible similar to those of radio VLBI hold the promise of providing high resolution astronomical measurements within reasonable launch constraints on mass and volume. Technology challenges in the optics, structures, and controls areas are addressed.