OBSS will provide the positions, proper motions, parallaxes, and photometry of stars as faint as 15th visual magnitude with accuracies of 50 microarcseconds at 9th visual magnitude and 500 microarcseconds at 15th visual magnitude. It will provide vital and fundamental astronomical data that address key questions of three NASA themes:

The results of the OBSS project will contribute to the NASA Strategic Plan by helping to answer the fundamental questions of how did the universe begin and what is its ultimate fate? and how do galaxies, stars, and planetary systems form and evolve? OBSS fits into the following strategic plan science goals: (1) understand how both dark and luminous matter determine the geometry and fate of the universe; (2) understand the dynamical and chemical evolution of galaxies and stars and the exchange of matter and energy among stars and the interstellar medium; and (3) understand how stars and planetary systems form together. OBSS will help fulfill the following strategic plan scientific objectives: (1) measure the amount and distribution of dark and luminous matter in the ancient and modern universe and (2) observe and characterize the formation of stars, protoplanetary disks, and planetary systems, and detect Neptune-size planets around other stars. OBSS will complement and support SIM and TPF in fulfilling the strategic program for 2000-2004 goals to: (1) understand how both dark and luminous matter determine the geometry and fate of the universe and (2) understand how stars and planetary systems form together.

In addition, for all themes and all astronomy, OBSS will provide the most accurate reference frame ever obtained.

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