Peter Jenniskens said the meteorite crash that sent the Hillsborough meteorite through a New Jersey home left scientists with unusually clean material to study. The fragment punched through a ceiling in July 2024 and landed on a bedroom floor before the homeowner gathered it with gloves and aluminum foil.
The discovery, published in Science Advances, centers on evidence that concentrated salty brines once flowed through the meteorite’s parent asteroid. Jenniskens said the fragments preserved bits from near the surface of a small primitive asteroid where concentrated salty fluids had occurred, and that the homeowner’s quick reaction left these as the most pristine CM1/2 meteorites known.
July 2024 over New York
In July 2024, a fireball exploded over the New York metropolitan area and produced a sonic boom. As the meteor plummeted, it broke apart in spectacular fashion, with fragments raining down over Staten Island toward New Jersey. The Hillsborough meteorite was the only fragment recovered from the home where one piece reached the bedroom floor.
Its fall was recorded by multiple cameras, including doorbell cameras and meteor-observing networks, and its atmospheric entry may have been observed by millions of people. Because the meteorite escaped rain and soil contamination, scientists had material that preserved chemistry from before it reached the ground.
Science Advances findings
Scientists found unusual minerals and a rich suite of organic compounds in the Hillsborough meteorite, along with salt-rich inclusions that likely came from near the surface of the parent asteroid. Calculations of the rock’s trajectory suggested that it originated from the asteroid belt between Mars and Jupiter, and its minerals showed that Hillsborough’s parent body belonged to the same class of carbon-rich asteroids that produced CM meteorites.
CM meteorites are named after the Mighei meteorite that fell over Ukraine in 1889, and they are thought to preserve some of the earliest material in the Solar System. The Hillsborough sample adds a complication to the simple picture of a dry rock: it carries signs of concentrated salty fluids, yet other minerals suggest aqueous alteration, pointing to water-driven chemistry inside the asteroid rather than surface weathering on Earth.
Hillsborough fragments
The homeowner used gloves and aluminum foil to scoop up the fragments and contain them in glass jars. That quick handling mattered because the meteorite landed in a house and remained far less altered than most meteorites that sit exposed after a fall.
Jenniskens said the preserved fragments were near the surface of a small primitive asteroid where concentrated salty fluids had occurred, a process he said was not previously known from this type of proto-planet world. For readers holding a piece of the story, the immediate task is simple: keep any fragment sealed and untouched, because the value here lies in preserving the chemistry exactly as it fell.
