A group dedicated to recording meteors and fireballs said it's investigating whether the object was a meteor or space debris.
The National Weather Service's Salt Lake City office wrote that it likely picked up the meteor's trail.
Internal emails expose how NASA scientists missed what they called the "largest asteroid" to "pass this close to Earth in the last century."
The meteor was not even that big by NASA's standards.
Hundreds filed reports with the American Meteor Society after spotting a bright blue-green meteor in the sky on Tuesday.
The fireball lit up the night sky as though a stadium turned on its lights, a Tallahassee resident said.
The National Weather Service in Detroit confirms that the "flash and boom" were not from lightning.
The incredible sight was reported by people in at least nine states and Canada.