A 50kg fireball tore through a New Jersey ceiling: the meteorite’s secrets go back 4.5 billion years

On 16 July 2024, a bright object streaked across the eastern United States sky, triggering a loud sonic boom that was heard from New York to New Jersey. Estimated to have weighed around 50 kilograms before it broke apart in the atmosphere, the object sent one fragment through the roof and ceiling of a bedroom in a Hillsborough, New Jersey home.

The homeowner who found the fragments quickly realised something was unusual about them. The dark pieces carried a strong sulphur-like smell, and rather than treating them as ordinary debris, the homeowner handled them with gloves and stored them in containers instead of touching them directly. That decision limited contamination from skin oils and moisture, a common issue for carbon-rich meteorites that can easily absorb material from their surroundings.

Laboratory analysis later classified the object as a CM1/2 carbonaceous chondrite, a rare hybrid group that formed around 4.5 billion years ago, in the earliest stages of the solar system. Some sections of the meteorite reflect past reactions with water, while others remain relatively unchanged, meaning the sample carries features of both the CM1 group, which underwent more water alteration, and the CM2 group, which experienced fewer changes.

Within the fragments, scientists identified organic materials and amino acids, compounds associated with the chemistry of life, though their presence does not confirm that living organisms existed in the meteorite. Tiny mineral deposits also revealed salt-rich material, suggesting the parent asteroid once held pockets of liquid water that later evaporated and left minerals behind.

Despite the impact and its landing inside a house, much of the meteorite’s original material stayed intact. Although some fragments picked up small traces of the roof and carpet they struck, scientists have described the Hillsborough meteorite as one of the better-preserved samples of its type collected in recent years.

To reconstruct the object’s path, researchers relied on videos captured by members of the public, security camera footage and weather radar from Newark Airport, which detected a trail of smaller fragments falling across the region as the meteorite broke apart. The data suggests the object originated in the inner region of the asteroid belt, located between Mars and Jupiter.

Image credit: Wikimedia Commons/by James St. John