Saw a sphere shape light hovering off rimrock, it moved very fast, and was gone in an instant.I was in the high school parking lot heading out to my car when something caught my eye towards the rimrock. It was a light that was moving very fast, I could tell that it wasn't on the ground because of how fast it was moving. At first it was a bright white light but after about five seconds it dipped off the rimrock and turned a pale green color. As it hovered off of the rimrock I could tell that it was a sphere shape. After that it was gone in an instant. It made no noise and I was alone, I was quite afraid of what I'd seen.