It will be decades before a flagship class mission in the ultraviolet will be implemented to succeed the
Hubble Space Telescope. However, advances in technology can enable smaller aperture systems to achieve and
surpass HST sensitivity by reducing attacking the noise portion of the signal/noise calculation. Through the use of
ultra-low noise photon counting detectors, low scatter optics, and optical design, instruments in the ultraviolet can be
developed that can attack critical science questions that cannot be addressed by current instrumentation, even in an
Explorer class mission.
James C. Green, James C. Green,
"Little mirror, big science", Proc. SPIE 8443, Space Telescopes and Instrumentation 2012: Ultraviolet to Gamma Ray, 844302 (17 September 2012); doi: 10.1117/12.924106; https://doi.org/10.1117/12.924106