[troutman]

Originally Posted by arsenal

I wonder if the jets used in the landing may have changed the composition of the dirt in way to make it clumpy.

It could be due to just a very tiny amount of absorbed moisture, perhaps even from the spacecraft's landing rockets, or the glue might be some kind of salts or even electrostatic forces or a combination of all of those, he said. The team is continuing to debate and discuss the possibilities.