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Home Science & Environment Space Exploration

A Tough Drill at Witch Hazel Hill

May 15, 2025
in Space Exploration
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Written by Alex Jones, Ph.D. candidate at Imperial College LondonĀ 

After a busy few months exploring the outer slopes of the Jezero crater rim at an area named ā€œWitch Hazel Hill,ā€ the Perseverance Science Team was eyeing another sample of these truly ancient rocks, which likely predate Jezero crater itself.Ā Ā 

The target? A rock containing spherules, which could shed a light on volcanic- or impact-related processes occurring in Mars’ most ancient past. After a search of several outcrops, the ā€œHare Bayā€ abrasion patch at ā€œPine Pondā€ revealed suitably accessible and spherule-bearing bedrock for sampling.Ā 

On Sol 1483 of the mission, sampling was a-go… But Mars wasn’t keen to give its secrets away too easily.Ā 

As data began arriving on Earth, it became clear Perseverance had managed to drill into the rock but had stopped short of retracting the drill and storing the sample. It transpired that this rock was particularly hard — a far cry from the crumbly rocks of the upper crater rim that fell apart when faced with Perseverance’s drill bit.Ā Ā 

This isn’t the first time a hard rock has gotten in the way of sampling; an extremely hard-to-crack boulder on the Jezero fan top stopped the drill short. This time though, the drill penetrated the rock as expected, but faulted during retraction. After a few sols of hard work by the engineering team, however, there were smiles all round as images of the successfully retracted drill reached Earth.

But Mars wasn’t finished with surprises yet.

The ā€œBell Islandā€ core contained the spherules the team were looking for, but the sample tube was overfilled. This meant that excess core length would prevent the sample from being sealed. In the end, the team opted to execute a dump activity to clear at least some of the sample out of the tube. This activity succeeded in removing enough sample that the tube can now be sealed in the future. As has been the case in the past on Mars, the most exciting discoveries often require a little Perseverance…

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