brilliant light coming and going

i was sitting on a bicycle in my grandmothers driverway...with my cousin..a very bright brilliant light at first white..changing into blue and shades of redish orangish like a fire...lit up all of the sudden..it acted as if it was a rocket and shot straight up...at what seem about 3/4 of a mile away and was no sound at all...the light went up for i'd say about 5 or 600 yards and quickly dissapated..we both looked at each other and i seen a shadow off of my cousin standing beside me when the light came back but much lower in the sky..we both thought that it was a rocket the way it went back up but at a angle like 75 degrees or so..once again it was changing colors and moving very quick with no sound...it then went out like a rocket out of fuel...and once more came back to light the sky just a little lower than when it burnt out...and shot straight up for at least 1000 ft and took a turn toward the north and was gone...to this day i have no idea what it was