The Space Interferometry Mission PlanetQuest (SIM) a 9-m Michelson
interferometer operating in the visible band. With an anticipated
accuracy of 4 microarcseconds (all sky, wide angle) and precision of 1
microarcseconds (narrow angle). These two modes will enable to make
fundamental advances in Galactic astronomy, determine the matter makeup
of our Galaxy and the Local Cluster, study dark matter halos,
decisively define the cosmic distance scale and undertake comprehensive
search for planets down to the mass of Earth.
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