There’s a mole on Mars that’s making NASA engineers tear their hair out.

No, they haven’t discovered a small, insectivorous mammal on the red planet.

The mole vexing engineers at the Jet Propulsion Laboratory in Pasadena is a scientific instrument known as the Heat Flow and Physical Properties Package, or HP3 — or just “the mole” — carried on NASA’s InSight probe that landed on Mars a year ago.

“The mole is designed to measure heat flow coming out of the interior of Mars,” says Troy Hudson, InSight’s instrument system engineer.

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