Artist’s impression of Ariel. (IMAGE) Europlanet Caption Artist’s impression of the Ariel Mission. The European Space Agency’s Ariel telescope, which launches in 2029, will study the atmospheres of around 1000 planets outside our solar system, known as exoplanets. Credit ESA/STFC RAL Space/UCL/UK Space Agency/ ATG Medialab Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.