Holy crap, that's a HUGE surprise and opens the possibility that signs of life could also be found!
"Asteroid Bennu may be a fragment of an ancient ocean world. That's still highly speculative. But it's the best lead I have right now to explain the origin of that material," principal investigator for OSIRIS-REx, Dante Lauretta of University of Arizona said.
That is some light particles! They have 0.2 grams, which includes: "over a 1,000 particles that are greater than half-a-millimeter, 28 particles that are greater than a centimeter, and the biggest particle is 3.5 centimeters,"
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