Planet Mars: How do rover robots look for possible ancient life from rock samples?

Image source, NASA/JPL-CALTECH

Caption,

A rock slab known as a Rochette with two holes made by the Mars rover.

Scientists from the US space agency (NASA) rejoice with rock samples on Mars taken by the Perseverance rover last week. They moved the robot to take a second sample.

Perseverance drilled a rock core the size of an index finger on 6 September, and repeated the procedure a few days later.

Scientists believe the rock that was targeted is of volcanic origin, meaning it can be dated accurately.

This stone also contains salt, which indicates changes in water, and raises the possibility of life.

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