Fire ball in sky over Safford ArizonaIt was shift change and I was relieving the employee before me. I looked to the sky and saw a large "fireball" like object form in the sky overhead. It split into 4 smaller fireballs which flew around a bit and then reconverged into one and disappeared. My coworker saw it as she stood beside me.As soon as the fireball disappeared it looked like there were many many plane lights blinking on and off around the same area the "fireballs had converged to" We didn't think there was any possible way that many planes should be in that small an airspace. I'm not sure what this was but it was unlike anything else I have seen.