Fire in the Sky
Many said they saw the streak of light around 9pm and described it as moving slower than most shooting stars.
They also described colors of green, orange and yellow associated with the light. 9NEWS received reports from Denver, Aurora, Greeley and other locations in the state.
An astronomy and physics professor with Metropolitan State University, Dr. Kamran Sahami, said the green color suggests a meteorite made up of rock, possibly a metal such as nickel.
9NEWS has not confirmed the exact source of the light.