PLATO (for Planetary Transits and Oscillations of Stars) is an European Space Agency spacecraft under construction aimed at finding extra-solar planets. It is aimed at relatively bright stars (magnitudes 4-11), that will support informative follow-up studies. It will identify extrasolar planets by spotting transits and radial velocity variations, and transit timing variations. Plans are to launch in 2026.
PLATO 2.0 was a 2014 proposed plan update during PLATO's planning stage, which emphasized aiming for terrestrial planets in the habitable zone of Sun-like stars