Instrument Deployment Camera on Mars InSight lander showing scoop "pinning" thermal instrument called the mole.

Instrument Deployment Camera on Mars InSight lander showing scoop "pinning" thermal instrument called the mole.

NASA/Caltech-JPL

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A sophisticated thermometer on NASA's Mars InSight lander has been stuck for months. It was supposed to drive down 16 feet into the Martian soil but stopped. So scientists used a novel way to free it.

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