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Update and bumped: More details have been released about what was inside the Hayabusa capsule. In total, two 0.01 millimeter particles have been found in the inner capsule, and about 10 large particles in the outer capsule.
The first photo from inside the Hayabusa capsule has been released, showing the presence of a tiny 0.01 millimeter particle. It is still unknown whether this is an asteroid particle or something captured on the return to Earth.