It never really worked. The Martian dirt has proved to be unexpectedly prone to clumping up, diminishing the sort of friction the mole needs to spike its way deeper and deeper. Ground crews came up with a last-ditch effort recently to use InSight’s arm to scoop some soil onto the probe to tether it down and provide more friction. After attempting 500 hammer strokes on January 9, the team soon realized there was no progress to be had.
It’s discouraging news, given that NASA just recently decided to extend InSight’s mission to December 2022. During that time, there won’t be much of a role for the heat probe. Bruce Banerdt, the InSight principal investigator, says that the planet’s temperature could still be measured at the surface and a few inches below the surface using some of the instruments on InSight that still work. “This will allow us to determine the thermal conductivity of the near surface, which might vary with season due to changing atmospheric pressure,” he says.
And while the mole was unable to accomplish what was expected, it’s not accurate to see this as a failure. “We have encountered new soil properties that have never before been encountered on Mars, with a thick, crusty surface layer that decreases its volume substantially when crushed,” says Banerdt. “We do not yet understand everything we have seen, but geologists will be poring over this data for years to come, using it to tease out clues to the history of the Martian environment at this location.”
InSight will continue on with some of its other investigations, especially the measurement of seismic activity on Mars. It turns out the Red Planet is rocked by quakes all the time.
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