about 5 pm a round silver shaped ufo about 6 feet across at 5000 feet went in a drifting zig zag direction from west to east to east to south and then my mother a i lost sight of it and i was calm light thermal blue sky and the object flashed the sun light and i took photos of it ..this is the 4th time i have witnessed the object in canberra with others over the last 20 years and if it was a ballon how did it move the way it did in the conditions((NUFORC Note: Witness elects to remain totally anonymous; provides no contact information. Probable hoax. PD))