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    In 2007, three large ('L-class') missions, namely, EJSM-Laplace, IXO and LISA, were selected for an Assessment Phase study following a Call for Missions for the first L-class mission opportunity in ESA's Cosmic Vision 2015-2025 plan. In 2011, ESA decided on a new way forward for these L-class mission candidates to take account of developments with ESA's international partners. During the reformulation exercise IXO became ATHENA.

    Latest News

    New approach for L-class mission candidates 19 April 2011 ESA has decided on a new way forward for L-class mission candidates in the Cosmic Vision programme. This new approach takes account of recent developments with ESA's international partners. Read more

    Scientists discuss progress in next generation X-ray observatory 18 May 2010 The Second International X-ray Observatory (IXO) Science Meeting, held at the Cité Universitaire in Paris, and attended by almost 200 participants, provided a timely opportunity to review the progress that has been made on IXO in a number of areas. Read more


    • Shortcut URL
    • http://sci.esa.int/ixo
    • See Also
    • Cosmic Vision 2015-2025
    • Highlights
    • L-class missions presentation event 2011
    • Related Missions
    • ATHENA

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