Describe one of the future planned space missions to search for extrasolar plane

There are several possibilities here, described in Section 13.4. E.g. Kepler and COROT will search for the miniscule dip in star brightness from a transiting Earth-like planet, SIM and GAIA will use space-based interferometry to measure the miniscule movements of stars as they are tugged by planets orbiting around them. TPF and Darwin will use the next generation of interferometers to cancel out the starlight and image the planets directly, even taking spectra of their atmospheres. All these programs are huge improvements on current observations by being able to detect low mass, Earth-like, planets, to survey many more stars, and ultimately to image and take spectra of other planets.