This is an impression of how the first stage of deployment looks for the Mars Express MARSIS experiment. The 13 segments of the first 20-metre boom have sprung out and locked into place.
The MARSIS experiment will map the Martian sub-surface structure to a depth of a few kilometres. The instrument's 40-metre long antenna booms will send low frequency radio waves towards the planet, which will be reflected from any surface they encounter.
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