NASA's OSIRIS-REx captured this mosaic of asteroid Bennu showing a surface completely covered in loose boulders and rocky debris. The imaging reveals the asteroid's rubble-pile structure - basically a gravitationally bound collection of rocks rather than a solid monolithic body. This matters for asteroid deflection strategies and understanding early solar system formation, since Bennu is a carbonaceous asteroid that's been relatively unchanged for 4.5 billion years. The loose surface also explains why OSIRIS-REx's sampling arm sank way deeper than expected during collection - the regolith has extremely low density and cohesion.