Surface of asteroid Bennu soft like plastic ball pit, OSIRIS-REx spacecraft finds

 An amazing surprise greeted NASA's OSIRIS-REx spacecraft as it touched down on the asteroid

The asteroid was not what it seemed -- according to research published Thursday

After it analyzed data from the spacecraft, NASA said it would have sunk into the asteroid

 if it hadn't fired thrusters to lift off as soon as it collected the dust and rock samples because of its makeup.

That's because the surface of Bennu consists of loosely packed particles so lightly bound to each other that

 if a person were to step onto the asteroid surface it would feel like a pit of plastic balls

If Bennu was completely packed, that would imply nearly solid rock, but we found a lot of void space

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