Meteorite that landed in Cape Cod was a 'lone wolf' from the outer solar system, scientists find

A meteor exploded into a fireball about 30 miles above Cape Cod Bay this past spring, creating a superbolide event that was captured by instruments at MIT's Haystack Observatory in Westford. Phil Erickson, director of the observatory, said the bolide was a particularly large meteor, a few meters in size, that entered the atmosphere at space temperatures and heated up rapidly on the outside while its core remained very cold. The temperature gradient caused the meteor to explode, tearing itself apart and producing fragments that fell into Cape Cod Bay.

Erickson explained that Haystack Observatory runs a meteor radar continuously for measuring atmospheric properties, space weather, and solar system phenomena. The superbolide happened to appear in the radar's field of view during entry and splashdown, making it an unusually well-instrumented event. This prompted a collaboration among scientists in New Hampshire, New Mexico, Germany, and Norway to research the May fireball.

The research has both basic and applied science implications. Erickson noted that understanding the size distribution of meteors helps predict risks from larger asteroids with destructive consequences. He said there were three bolides in 2025, each releasing energy greater than a kiloton of TNT. The fragments that fell into Cape Cod Bay may be accessible, and colleagues at Woods Hole Oceanographic Institution may attempt to recover them for chemical analysis. Erickson said such recovery would "close the loop" on inferences made from radar measurements and improve future predictions when fragments cannot be recovered.

Erickson also emphasized that precise measurements from these events lead to better understanding of atmospheric fundamentals, which is becoming more urgent as humans become a spacefaring society with increasing satellite launches into low Earth orbit. He stated that understanding the atmosphere is critical for stable space travel to the moon and Mars, and that researchers are still "data-starved" for the basic physics and chemistry of the upper atmosphere.