Back in 1994, in Gosford Australia a series of sitings occurred in rapid succession. On Christmas morning the first witness reported seeing a metallic object moving in northerly direction. It was seen again by a second witness as it passed over the water outside her house. For the next several days, up until New Years Day the object was seen by multiple witness. People called in to the local police station to report sitings. They described a round metallic object with a bright light emanating from the bottom.
Investigators were sent out to attempt to unravel the mystery and identify it the object, but no celestial bodies in the evening sky, or atmospheric conditions or other explanations quite fit the bill.
It remains unexplained.