While driveing east on I 70 ( unsure of the exact mile marker and exact direction i was traveling at the time as the i70 changes direction in that area) i sa a very brief solid bright green light surrounded in a narrow ring of bright red traveling in the same direction as me. Visible through the passengers side windsheild from the roofline right corner downwards to the lower half center of the windsheild when i passed a group of trees and lost sight of it. It only lasted maybe less then 2 seconds. The sun had just gone down and i saw no trail or heard any sounds.
