俄罗斯发射火星探测火箭
A Russian rocket has lifted off from Kazakhstan in a new mission to find life on Mars.
一枚俄罗斯火箭在哈萨克斯坦点火起飞，该火箭承担着在火星上寻找生命的任务。
ExoMars is a joint project between the European and Russian space agencies.
The rocket will launch two unmanned probes which will travel across space for seven months.
The Trace Gas Orbiter will hunt for methane gas in the Martian atmosphere and show if it was generated by geology or biological processes.
Methane is a gas largely produced by living organisms and could prove life once existed on the planet.
The second probe, Schiaparelli, is a trial lander which will test technology ahead of the later mission.
ExoMars 2018 will send another rover built in the UK to drill below the planet's surface to look for signs of life.