The ExoMars Trace Gas Orbiter (TGO), along with an Entry, Descent and Landing Demonstrator Module (EDM), form the first mission in the ExoMars programme. The Orbiter and EDM are scheduled to arrive at Mars in 2016.
The ExoMars Orbiter will accomodate a suite of instruments to carry out a series of scientific investigations, including the search for evidence of methane and other trace gases in the Martian atmosphere.
The ExoMars EDM constitutes a technology platform whose main goal is to enable Europe to acquire the capability to land on Mars. Although designed to demonstrate entry, descent and landing technologies, the EDM also offers limited, but useful, science capabilities.