Japan recovers rocks from asteroid Ryugu

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Following last 12 months’s enthusiasm over organic compounds present in samples from the Ryugu asteroid, scientists from Imperial College London revealed that the microbial life discovered within the samples likely originated on Earth.

Hayabusa2 collected samples from Ryugu in 2019 and returned them to Earth in 2020. Scientists initially believed the samples could provide insight into the origins of life on Earth or confirm that asteroids are potential seeds of life. However, the microscopic “rods and filaments” discovered within the samples, identified as terrestrial microorganisms, grew over time, indicating lively colonization.

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Samples were transported and analyzed under fastidiously controlled conditions, including a hermetically sealed chamber, nitrogen-flushed clean rooms, and sterilized instruments. Still, the resilience of Earth’s microorganisms underscores how easily contamination can occur, even when extreme precautions are taken.

The study cautions against premature conclusions on future missions because Earth’s biota could by accident cross over into extraterrestrial samples, complicating efforts to discover evidence of extraterrestrial life.

The results were published in Meteoritics and planetary science.

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