A meteoroid-a small body moving through space-is called a meteor when it encounters a planet's atmosphere and subsequently produces a bright streak of light. This occurs because the meteoroid is traveling many times faster than the speed of sound.
Witnesses in Pittsburgh reported seeing what appeared to be a burning object streaking through the sky, describing it as 'a rocket or something like a meteor.' One local wrote online: '911 calls in the city. I have relatives who heard the boom from Hinckley, Ohio, all the way to Sandusky.'