PONTE VEDRA, Fla. โ€” The 18-nation European Space Agency (ESA) has given Thales Alenia Space an additional contract tranche valued at 98 million euros ($130 million) for work on U.S.-European Mars exploration missions planned for 2016 and 2018, Thales Alenia Space announced Aug. 9.

Under the contract, Thales Alenia Space will continue work on Europeโ€™s ExoMars portion of the missions through March 2011, after which another ESA contract is expected to carry the work to the construction phase.

The contract announced Aug. 9 permits France- and Italy-based Thales Alenia Space and its contracting team to complete the preliminary design review of ExoMars in late 2010, and to order certain components for the missions.

โ€œIn addition to ensuring program continuity and making sure we stay on schedule, this contract extension will support continued work by the programโ€™s subcontractors and help us minimize the development risks of such a new and complex mission,โ€ Vincenzo Giorgio, director of science programs at Thales Alenia Space, said in an Aug. 9 statement.

ESA and NASA are collaborating on a broad Mars exploration program that includes a communications relay to be launched in 2016, followed by a European-built rover mission to be launched in 2018.

Peter B. de Selding was the Paris bureau chief for SpaceNews.