  Because of the recent technological advances, the key technologies needed for
precision space optical astrometry are now in hand. The Microarcsecond
Astrometry Probe (MAP) mission concept is designed to find 1 Earth mass planets
at 1AU orbit (scaled to solar luminosity) around the nearest ~90 FGK stars. The
MAP payload includes i) a single three-mirror anastigmatic telescope with a 1-m
primary mirror and metrology subsystems, and ii) a camera. The camera focal
plane consists of 42 detectors, providing a Nyquist sampled FOV of 0.4-deg. Its
metrology subsystems ensure that MAP can achieve the 0.8 uas astrometric
precision in 1 hr, which is required to detect Earth-like exoplanets in our
stellar neighborhood. MAP mission could provide ~10 specific targets for a much
larger coronagraphic mission that would measure its spectra. We argue for the
development of the space astrometric missions capable of finding Earth-2.0.
Given the current technology readiness such missions relying on precision
astrometry could be flown in the next decade, perhaps in collaboration with
other national space agencies.
