UFO Sighting in Salt Lake City, Utah on 1995-06-18 22:00:00 - Ufo flying at extreme speed with extreme directional changes

I was in the desert in utah visiting friends in the summer of 1995. we were in toolie, about 4 hours from area 51. we were out star gazing one night on a particularly cloudless evening when we observed what we first thought to be a shooting star. we then saw it do a zig zag at incredible speed and shoot off, covering most of the visible horizon in a few seconds. we then drove to the top of a nearby hill to try and get some general telemetry. we observed the object again flying incredibly fast patterns and again covering most of the visible horizon in a few seconds. it was hard to gauge the speed not knowing what altitude the object was flying, but i'd guess it was around 4000 ft and had to be doing over 5000 mph. my personal guess is that it was something that they were testing at area 51, given the relative distance from their testing facility. it is also interesting to note that just prior to the sighting we heard cows at a nearby farm start to sound like they were in distress. we thought that it might be a coyote in the area, but in hind sight it may be that this vehicle was emitting a sound that they could hear, and that was painful for them. i would also add that, as with many other sightings whatever this was could not be manned unless there is some technology involved that would protect the pilot from the impossible g forces this thing would have to be creating making such extreme course changes at that speed.