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With the subsurface of Mars, we've literally just scratched the surface and we're trying to probe, now, more than a couple of feet into it.

Richard Zurek
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We are also interested in looking at the soils and rocks exposed during impact and making imaging and other measurements of these materials. This latter set of experiments will allow us to probe subsurface characteristics.

Ray Arvidson
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My view is that there is a good possibility there is life on Mars, probably in the subsurface. We know from examples on Earth that life can exist in extreme places, and Mars seems to have the necessary ingredients for that.

Thomas Mccollom
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