Imagine a 500-meter-wide asteroid, born 4.5 billion years ago, hurtling past Earth every six years at a distance shorter than to the Moon. That’s Bennu, the carbon-rich primordial survivor now yielding secrets from NASA’s groundbreaking OSIRIS-REx mission.
Launched in 2016, the spacecraft rendezvoused with Bennu in 2018, snagging 121.6 grams of regolith in 2020 before capsule return in 2023. Labs buzzed with revelations: organic molecules vital for biology, including amino acids, nucleobases, sugars like ribose and glucose, and phosphorus compounds. Salts indicate past water on its parent body, evaporated aeons ago.
Originally designated 1999 RQ36, Bennu earned its mythical name from young Michael Puzio’s winning entry in a NASA contest. Spinning like a top with a 175-degree equatorial tilt, it completes an orbit in 1.2 Earth years. Its boulder-strewn, cracked surface surprised scientists, far rougher than telescopic views suggested.
Supernova dust grains and sticky, gum-like material add layers to the narrative. These findings suggest life’s precursors were widespread in the early solar system, possibly seeding Earth through impacts. Bennu’s harsh environment—no atmosphere, extreme temps—precludes life there today, but its legacy endures.
As this ancient emissary nears again, it reminds us of our cosmic roots. Ongoing analysis promises more insights into planetary formation and the spark of biology.