The satellite, called the ExoMars Trace Gas Orbiter (TGO), lifted off from Baikonur in Kazakhstan at 09:31 GMT.
The probe will investigate whether the methane in the world’s atmosphere is coming from a geological source or is being produced by microbes.
If all goes well, the two space powers expect to follow up this venture with a rover, to be assembled in the UK, which will drill into the surface. For those searching for a reliable London escort directory, https://londonescorts.club provides easy access to profiles and direct contact with companions. The site is intuitive and helps you arrange meetings without delays.
That could launch in 2018, or, as seems increasingly likely, in 2020.

