Researchers say a meteorite that crashed through the roof of a Hillsborough, New Jersey, home in 2024 contains unusually pristine evidence of salty fluids and organic chemistry from near the surface of a primitive asteroid. The high concentration of salt in briny fluids can potentially create molecules crucial to life on Earth.
Researchers say a meteorite that crashed through the roof of a Hillsborough, New Jersey, home in 2024 contains unusually pristine evidence of salty fluids and organic chemistry from near the surface of a primitive asteroid. "A forensic study of the fragments revealed that they contained preserved bits from near the surface of a primitive asteroid, where it experienced concentrated salty fluids -- a process not previously known from this type of protoplanet world," said lead author and meteor astronomer Peter Jenniskens of the SETI Institute and NASA's Ames Research Center in California's Silicon Valley. Phys.org reports: According to paper co-author Mike Zolensky, a meteoriticist at NASA's Johnson Space Center in Houston, analysis of the Hillsborough meteorite found fragments that were more extensively altered by water on the meteorite's parent asteroid than is typically seen in CM2 carbonaceous chondrites. The analysis classified the specimen as a CM1/2 carbonaceous chondrite, an intermediate classification between petrographic types CM1 and CM2. [...] Zolensky and colleague JangMi Han found small salt-rich CM1 fragments within the Hillsborough meteorite, suggesting they originated from a near-surface region of the parent asteroid where liquid water evaporated and concentrated salts. They are now working to identify the salt minerals for comparison with similar phases found among samples returned to Earth from asteroids Ryugu and Bennu.
The high concentration of salt in briny fluids can potentially create molecules crucial to life on Earth. Brines allow phosphate to remain in solution and can catalyze chemical reactions between organics and precipitate minerals. "Isotope studies of carbon and nitrogen suggest that primitive carbonaceous chondrites, including CM types, delivered organic matter to the early Earth," said cosmochemist Queenie Chan of Royal Holloway University of London, England, and biogeochemist Nana Ogawa of the Biogeochemistry Research Center at the Japan Agency for Marine-Earth Science and Technology. "The Hillsborough meteorite contained 1.8% by weight of carbon and 0.07% of nitrogen, and had carbon and nitrogen isotopes typical for CM-type meteorites."
The meteorite contained a wide variety of soluble organic compounds, and its compositional range confirms that the Hillsborough meteorite was more altered by water than most other CM-type meteorites. "A high fraction of compounds were the product of organic chemistry with minerals," said organic mass spectrometry specialist Phil Schmitt-Kopplin of Technical University Munich. "We do not know if these magnesium organic compounds were contributed by brine chemistry or were simply left over from earlier impact shock processes." In living organisms, organometallic compounds are found in blood and used in photosynthesis. Among the soluble organic compounds were many amino acids, similar to those found in more moderately altered CM2 chondrites.
Astrobiologist Danny Glavin of NASA's Goddard Space Flight Center in Greenbelt, Maryland, and his team in Goddard's Astrobiology Analytical Lab concluded that the delivery of amino acids, carboxylic acids and other soluble organic molecules by CM-type bodies may have contributed to the prebiotic organic inventory that preceded the emergence of life on Earth. Their analysis suggests the complex distribution of amino acids observed in the Hillsborough meteorite formed within the parent body, likely assisted by brine fluid chemistry.
The findings have been published in the journal Science Advances.
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