June 28th, 2024

Surprising Phosphate Finding in NASA's Osiris-Rex Asteroid Sample

NASA's OSIRIS-REx mission found carbon, nitrogen, organic compounds, and phosphates in asteroid Bennu's sample, hinting at a watery past and potential origins from a primitive ocean world. The composition resembles Earth's rocks, offering insights into solar system formation and prebiotic chemistry.

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Surprising Phosphate Finding in NASA's Osiris-Rex Asteroid Sample

NASA's OSIRIS-REx mission has made a surprising discovery in the asteroid Bennu sample it collected. The analysis revealed the presence of dust rich in carbon, nitrogen, organic compounds, and magnesium-sodium phosphate, essential components for life. The phosphate finding suggests Bennu may have originated from a primitive ocean world. The sample's composition, dominated by clay minerals like serpentine, mirrors Earth's mid-ocean ridge rocks. The presence of water-soluble phosphates, crucial for biochemistry, hints at Bennu's watery past. This finding raises questions about geochemical processes and historical conditions on Bennu. The asteroid's elemental proportions resemble those of the Sun, offering insights into the early solar system. The rich carbon and nitrogen content in Bennu's materials provide clues to the chemical processes that could have led to the emergence of life on Earth. Further analysis of the Bennu sample by labs worldwide is expected to yield more discoveries about solar system formation and prebiotic chemistry. The OSIRIS-REx mission, which collected the sample, delivered it to Earth in 2023, marking a significant milestone in asteroid research.

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By @pfdietz - 4 months
Small bodies in the early solar system were likely heated by short lived radionuclides, which were injected into the gas cloud that formed the solar system by a nearby supernova explosion. Remnants of the decay of such isotopes have been found in primitive grains in meteorites.

This heating would have kept the bodies warm enough for liquid water to exist in their interiors for a periods of perhaps some millions of years. The total volume of these could have been quite large, and offers the interesting possibility that life originated in our Solar System in one of these bodies, not on Earth itself. If so, this could explain why life appeared on Earth so early: if OoL tends to occur in such bodies, it either happens early (before they freeze up) or it doesn't occur at all. This would counter the inference that because life originated early on Earth, OoL must be a high probability event.

The presence of phosphate minerals is mildly promising as phosphate is somewhat rare and is biologically essential in nucleic acids, ATP, and some cell membranes.

By @mjevans - 4 months
What if the origin of Osiris-Rex (Asteroid) is higher energy debris from a major impact to Earth during the early stages of organic life on the planet. Wasn't one theory (?) for our moon's creation such an impact and then a large mass splitting off to form the moon? I could easily imagine smaller bodies with higher local concentrations of energy being ejected from such an event.
By @prewett - 4 months
> These rocks have retained their original state, having neither melted nor resolidified since their inception

How are they able to tell that?