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Arthur T Knackerbracket suggests a story from Phys.org:

An ambitious European mission is being planned to answer fundamental questions about how planetary systems form and evolve. ARIEL will investigate the atmospheres of several hundred planets orbiting distant stars. It is one of three candidate missions selected last month by the European Space Agency (ESA) for its next medium class science mission, due for launch in 2026. The ARIEL mission concept has been developed by a consortium of more than 50 institutes from 12 countries, including UK, France, Italy, Germany, the Netherlands, Poland, Spain, Belgium, Austria, Denmark, Ireland and Portugal. The mission will be presented today at the Pathways 2015 conference in Bern, Switzerland, by ARIEL's Principal Investigator, Prof Giovanna Tinetti of University College London.

"The essential nature of exoplanets is still something of a mystery to us: despite finding nearly 2000 exoplanets we haven't yet found any discernible pattern linking the presence, size or orbital parameters of a planet to what its parent star is like," said Tinetti. "If we are going to answer questions, such as how is the chemistry of a planet linked to the environment in which it forms, or is its birth and evolution driven by its host star, we need to study a statistically large sample of exoplanets. This is what ARIEL is designed to do."

During its 3.5-year mission, ARIEL will observe over 500 exoplanets ranging from Jupiter- and Neptune-size down to super-Earths in a wide variety of environments. While some of the planets known by the time of ARIEL's launch may be habitable, the main focus of the mission will be on exotic, hot planets in orbits very close to their star.