Fireball was seen by early morning commuters in Colorado on Wednesday . The fireball, which is about the size of a baseball, appeared to be traveling at supersonic speeds and could have been visible from as far away as Denver, according to CNN meteorologist Chad Myers. But glow came from meteor hitting the Earth 's atmosphere , NASA said .
Fireball was seen by early morning commuters in Colorado on Wednesday . Theories shared on social media ranged from bright aircraft to aliens . But glow came from meteor hitting the Earth 's atmosphere , NASA said .