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The Roman Space Telescope will offer a General Observer program that supports community-based observing programs. While the baseline mission emphasizes the dark-energy and exoplanet measurements, the additional surveys carried out via the General Observer program will exploit it's unique capabilities to substantially broaden the science return of the mission. The General Observer program will provide broad support to many fields of astrophysics in the tradition of HST, no doubt with the same astonishing results of new, creative, field-changing science. In an extended mission, the General Observer program would likely become the dominant part of the mission. HST has demonstrated clearly that the combination of a powerful facility and peer-reviewed proposals has the greatest impact in advancing the extraordinarily broad field of astrophysics research.
Appendix A of the Roman Space Telescope SDT (2013) report contains ~ 50 potential GO or Guest Investigator science programs, each described in one page, contributed by members of the broader astronomical community. Here we simply list their titles to illustrate the remarkable range of ideas for scientific investigations enabled by the Roman Space Telescope :