Darwin was a proposed ESA (European Space Agency) space-based interferometer to operate in the infrared part of the spectrum (see Infrared Space Interferometer). Its principal aims would have been to search for Earth-like planets around nearby stars and then look for signatures of life, such as the presence of ozone in the atmosphere. Darwin would have used a flotilla of six telescopes, each at least 1.5 meters in diameter.1 See extraterrestrial life, detection. Plans had called for a launch in about 2015 and to build on the work of the Eddington mission.
1. Leger, A., Mariott, J. M., Menesson, B., Ollivier, M., Puget, J. L., Rouan, D., and Schneider, J. "Could We Search for Primitive Life on Extrasolar Planets in the Near Future? The Darwin Project," Icarus, 123, 249 (1996).