So, apparently no matter how hard they try they can't get the InSight heat probe far enough into the surface of Mars to get results.
It seems there's a really solid soil layer not that far under the surface.
You know, if this was Earth, we'd be saying "Permafrost." There can't be that much water on Mars, but there's definitely something going on.
Or we're all wrong and it's permafrost.
(More likely it's old soil that's just dried out solid, but it resembles concrete).
Mars is weird.
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