UFO Sighting in Cleburne, Texas on March 15th 2014 – Round black hovering above us the like a pizza slice it opened up then mover south and stopped then open up again then it was gone 5 -8 seconds total time

My oldes son and I were star watching at my house in north Texas we see a lot of weird stuff in the sky out here at night well in March of 2014 we saw an object appear right above us around 100 to 500 ft instantly it was there just showed up not a sound it was. Huge about raise of a track at a high school then it opened up a wedge like a pizza slice bright as day then instantly it went south maybe 1/4 mile then opened up again then it was gone never seen anything like that before or sence