On July 16, 2024, a space rock roughly the size of a heavy airline bag and weighing approximately 110 pounds (50 kilograms) exploded through a bedroom ceiling in Hillsborough, New Jersey. The event, which occurred in the middle of the afternoon, was preceded by a sonic boom that shook New York City as the fireball streaked through the sky. The meteorite, which traveled over the East Coast before landing, was found by the homeowner reeking of sulfur.
Hillsborough Homeowner Preserves Pristine Meteorite Fragments
The survival of the Hillsborough meteorite for scientific study was the result of a rare, fortunate sequence of events. Unlike most meteorites, which are quickly contaminated by moisture, weather, or human handling, the homeowner protected the fragments immediately. According to the SETI Institute, the homeowner collected the pieces using disposable gloves and stored them in aluminum foil and glass jars. This precaution prevented the absorption of terrestrial oils and water, which is critical because carbonaceous chondrites are known to absorb moisture. By also contacting the American Meteor Society quickly, the homeowner ensured the samples remained unusually pristine for the international team of experts that followed.
Peter Jenniskens Traces Asteroid Belt Origins
Laboratory analysis published Wednesday in the journal Science Advances identified the rock as a rare, primitive material called a CM1/2 carbonaceous chondrite. These primitive rocks preserve some of the oldest materials in the solar system, recording chemical processes that shaped asteroids more than 4.5 billion years ago. Researchers, led by meteor astronomer Peter Jenniskens of the SETI Institute and NASA’s Ames Research Center, used cameras across New Jersey that captured the fireball’s passage to reconstruct its trajectory. By combining this data with laboratory analyses, scientists determined where in the asteroid belt the rock most likely originated.
Queenie Chan and Nana Ogawa Analyze Organic Matter
A forensic study of the fragments found that before the meteorite broke off from its parent asteroid, it had been covered in "concentrated salty fluids," or a brine. This phenomenon had never been seen before on this kind of object. The high concentration of salt in these brines is scientifically significant because brines allow phosphate to remain suspended in a solution and can catalyze chemical reactions between organic materials and minerals.
"In a way, you can think of it as smelling the origins of life’s atmosphere," Peter Jenniskens said in a statement.
Cosmochemist Queenie Chan of Royal Holloway University of London and biogeochemist Nana Ogawa of the Biogeochemistry Research Center at the Japan Agency for Marine-Earth Science and Technology noted that isotope studies of carbon and nitrogen suggest primitive carbonaceous chondrites delivered organic matter to the early Earth. The Hillsborough meteorite contained 1.8% by weight of carbon and 0.07% of nitrogen, with carbon and nitrogen isotopes typical for CM-type meteorites.
The meteorite also contained a wide variety of soluble organic compounds, and its compositional range confirms it was more altered by water than most other CM-type meteorites. Organic mass spectrometry specialist Phil Schmitt-Kopplin of the Technical University Munich stated, "A high fraction of compounds were the product of organic chemistry with minerals." He added, "We do not know if these magnesium organic compounds were contributed by brine chemistry or were simply left over from earlier impact shock processes." Among these soluble organic compounds were amino acids, similar to those found in more moderately altered CM2 chondrites.
Astrobiologist Danny Glavin of NASA’s Goddard Space Flight Center and his team in the 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.
The SETI Institute described the find as "one of the most scientifically valuable meteorites ever recovered." Because the rock was recovered immediately upon its fall, it is helping NASA scientists uncover new clues about ancient water and the chemical evolution of primitive asteroids. By documenting the fireball and ensuring a quick recovery, researchers were able to learn not only the chemical composition of the rock but its specific origin within the solar system.
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