The probe initially landed on Ryugu in February and collected shallow samples from just below the surface, but mission managers decided to gather some deeper rock samples as well, since that material hasn't been exposed to harsh weathering from space.
To accomplish that, the probe had to lift back off the asteroid, then blast a 10-meter crater into the surface in order to access to the rock beneath.
So in April, Hayabusa-2 released and detonated a box of explosives in space that shot a copper plate into the asteroid.
Wednesday's landing then made a splash in all that freed-up material.
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