Several billion years ago, at the dawn of the solar system, a wet, salty world circled our sun. Then it collided, catastrophically, with another object and shattered into pieces.
One of these lumps became the asteroid Bennu whose minerals, recently returned to Earth by the US robot space probe OSIRIS-REx, have now been found to contain rich levels of complex chemicals that are critical for the existence of life.
“There were things in the Bennu samples that completely blew us away,” said Prof Sara Russell, cosmic mineralogist at the Natural History Museum in London, and a lead author of a major study in Nature of the Bennu minerals. “The diversity of the molecules and minerals preserved are unlike any extraterrestrial samples studied before.”
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