Proposed European Space Agency space telescopes

third large mission of Cosmic Vision; gravitational-wave space observatory

space telescope

thumb|305x305px|ESA's exoplanet missions Ariel (Atmospheric Remote-sensing Infrared Exoplanet Large-survey) is a planned space telescope and the fourth medium-class mission of the European Space Agency's Cosmic Vision programme. The mission is aimed at observing at least 1,000 known exoplanets using the transit method, studying and characterising the planets' chemical composition and thermal structures. Compared to the James Webb Space Telescope, Ariel will be a much smaller telescope with more observing time available for planet characterisation. Ariel was expected to be launched in 2029 aboa

planned X-ray telescope of the European Space Agency, under development for launch around 2028