A radar instrument co-sponsored by NASA on the European Space Agency's Mars Express orbiter has looked beneath the surface of Mars and opened up a new dimension for planetary exploration.
The technique's success is prompting scientists to think of other places in the solar system where they would like to use radar sounders. The radar sounder on Mars Express is the Mars Advanced Radar for Subsurface and Ionospheric Imaging, or MARSIS. It was built to map the distribution of liquid and frozen water in upper portions of the planet's crust.
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