The neon blue object was visible as far as 400 miles away, the Casper Star-Tribune reported Monday.
One witness, Jordan Dowers, said, "the sky lit up really bright" as he drove along Interstate 80 near Laramie Sunday night. He described the trail of the meteor as "much, much brighter than lightning. From the south, it was neon blue."
Dowers said he expected the object to hit the ground, but it "just disappeared."
Other sightings of the fiery object came from as far way as Idaho and Colorado.
Tom Hankey, a volunteer with the American Meteor Society, said the meteor, called a bolide, probably traveled 150 miles across the sky.
Bolides are meteors that explode, leaving behind meteorites. They typically create a blue light as they travel through the atmosphere.