NASA is sending a robotic geologist to Mars and it will dig deeper than ever before.
The Mars InSight spacecraft is set to launch this weekend from California.
The lander has a slender probe designed to burrow nearly five metres into the martian soil.
That's for taking the planet's temperature. To take the planet's pulse, a quake-measuring seismometer will operate directly on the Martian surface.
The US-European mission is the first dedicated to studying the insides of Mar.
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Lift off is scheduled for early Saturday from Vandenberg Air Force Base.
NASA last landed on Mars six years ago.
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