Euclid is an ESA mission selected for launch in 2019 in the Cosmic Vision 2015-2025 programme. The main goal of Euclid is to understand the origin of the accelerating expansion of the Universe. To achieve this, it is proposed to build a satellite equipped with a 1.2 m telescope and three imaging and spectroscopic instruments working in the visible and near-infrared wavelength domains.
The primary goall is to understand the nature of dark energy and dark matter by accurate measurement of the accelerated expansion of the Universe through different independent methods.