The first ExoMars launch is due this Monday (0931GMT); the launch window for Mars extends until 25 March. The payload comprises the Trace Gas Orbiter (TGO - which will analyse the atmospheric chemistry looking for signs of biological processes) and the Schiaparelli demonstration lander (scheduled to land 19 October 2016). The rover portion of the programme will follow up with a launch in May 2018. The primary scientific objective of the ExoMars mission is to look for past or present biosignatures. The programme will progressively test and develop technologies for: entry, descent and landing (EDL) of a payload on the surface of Mars, surface mobility with a rover, access to the subsurface to acquire samples and sample acquisition/preparation/distribution/analysis. The rover is to target areas most favourable to organic material and will drill for samples to depths of 2 metres (the drill on Curiosity can only sample down to a few centimetres, by comparison). Streamed launch coverage will be found here starting at 0830GMT, Monday.