Meteorite punched through New Jersey home
On July 16, 2024, a daytime meteor sparked a sonic boom that shook New York City as it raced south of the Statue of Liberty. Minutes later, a meteorite weighing more than two pounds tore through the roof of a house in Hillsborough, New Jersey, scattering black debris across a bedroom.
The homeowner said: "I was at home at the time, heard a loud crash and found a hole in the ceiling of the master bedroom. I smelled a strong sulphur-like odor and saw many black fragments along with debris and black dust that covered my bed, carpet and surrounding areas." He immediately preserved the scene, using disposable gloves and aluminium foil to place the meteorite fragments in glass jars.
Forensic study reveals salty 'alien world' fluids
The results of a comprehensive examination, carried out by an international research team including scientists from the SETI Institute, have now been published in the journal Science Advances. Lead researcher Dr Peter Jenniskens said: "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 proto planet world."
Dr Jenniskens observed that the rock, roughly the size of a heavy airline bag, entered Earth's atmosphere travelling at 32,000 miles per hour. The fragile space rock quickly broke apart and vanished from sight at an altitude of 22 miles.
Eyewitnesses and radar tracked the meteor
Sixty eyewitnesses spanning New York, New Jersey, Connecticut, Rhode Island and Pennsylvania submitted reports to the American Meteor Society, while 16 people in New York and New Jersey felt the shockwave. American Meteor Society operations manager Mike Hankey said: "Our cameras in Northford, Connecticut, and Douglassville, Pennsylvania, as well as a doorbell camera in Wayne, New Jersey, captured the meteor, and from that we measured its trajectory. The path traced back to low in the asteroid belt."
After the meteor disappeared, Doppler weather radar at Newark Airport briefly picked up an elongated cloud of falling pebbles stretching from Staten Island into New Jersey. Hillsborough lay at the far end of that debris cloud, where the heaviest fragments came down. Only one piece was recovered because it hit a property.
A rare CM-type meteorite fall
Examination identified the fragments as a CM-type carbonaceous chondrite, a primitive class named after the Mighei meteorite that fell in Ukraine in 1889. Study co-author Dr Mike Zolensky of NASA revealed that the fragments had experienced far more extensive water alteration than is commonly seen in CM2 carbonaceous chondrites. It was the 22nd recorded CM-type meteorite fall, yet only the second witnessed fall of a CM1/2 carbonaceous chondrite, following the Kolang meteorite that descended in North Sumatra, Indonesia, in 2020.
Dr Jenniskens said: "Thanks to the homeowner's quick reaction, these are the most pristine CM1/2 meteorites we know of."
How brines could spark life's chemistry
Dr Zolensky and colleague Dr Jangmi Han uncovered small salt-rich CM1 fragments within the meteorite, suggesting they originated from a near-surface region of the parent asteroid where liquid water had evaporated, leaving concentrated salts. The research team is working to identify the salt minerals and compare them with samples returned from other asteroids.
According to the researchers, the elevated salt concentration in briny fluids could potentially produce molecules essential to life on Earth. Brines enable phosphate to remain in solution and can trigger chemical reactions between organic compounds and precipitating minerals.
Cosmochemist Dr Queenie Chan from Royal Holloway University of London said: "Isotope studies of carbon and nitrogen suggest that primitive carbonaceous chondrites, including CM-types, delivered organic matter to the early Earth. 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."
Amino acids and organic molecules
The meteorite contained a diverse range of soluble organic compounds, with a compositional profile indicating it underwent more water-based alteration than most other CM-type meteorites. Organic mass spectrometry specialist Professor Phil Schmitt-Kopplin, from Technical University Munich, said: "A high fraction of compounds were the product of organic chemistry with minerals. We do not know if these magnesium organic compounds were contributed by brine chemistry or were simply left over from earlier impact shock processes." He noted that organo-metallic compounds are found in blood and play a role in photosynthesis in living organisms.
The soluble organic compounds also featured a substantial number of amino acids. NASA astrobiologist Dr Danny Glavin and his research team 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 life's emergence on Earth. The complex distribution of amino acids identified in the meteorite formed inside the parent body, most likely facilitated by brine fluid chemistry.
Museum display in New York City
Some of the meteorite fragments will now be displayed at the American Museum of Natural History in New York City. Curator Denton Ebel said: "We are thrilled that nature delivered such a precious asteroid sample on our doorstep."
