OSIRIS-REx Samples from Asteroid Bennu Suggest Space Origins for Life's Ingredients on Earth
Recent studies of samples from asteroid Bennu, collected by NASA's OSIRIS-REx mission, have revealed the presence of ribose, glucose, amino acids, and nucleobases. These findings support the 'RNA world' hypothesis, suggesting that asteroids could have delivered key molecules required for life to Earth over 3.5 billion years ago. The samples also contained nitrogen-rich polymers and presolar grains from supernovae, indicating that the asteroid's parent body formed in the early solar system. This research provides crucial insights into how Earth acquired the chemical ingredients necessary for the emergence of life.
Key Points
- Samples from asteroid Bennu contain ribose (a sugar in RNA), amino acids, and nucleobases essential for life.
- The discovery supports the theory that life's building blocks were delivered to Earth via space rocks.
- Bennu contains presolar grains from supernovae, which are older than the sun itself.
- The presence of nitrogen-rich polymers suggests chemical reactions occurred on the asteroid's parent body.
Exam Facts
- NASA's OSIRIS-REx mission returned the Bennu samples to Earth in September 2023.
- The studies were published in journals including 'Nature Geoscience' and 'Nature Astronomy'.
- The asteroid Bennu is approximately 4.6 billion years old.
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