Unidentified Flying Objects were spotted drifting over Mt Annan on Sunday night, which may be proof we aren't alone in the universe after all.

A Macarthur Chronicle reader has sent in pictures of a mysterious light moving across the sky, which were snapped at 8.30pm on December 1.

The reader, a local business owner who did not wish to be named, said she and her family watched the four UFOs pass over their home.

"They were very high up in the sky, too high for a helicopter and distinctly round and definitely not a plane of any sort. They glided very fast and with no sound," she said.

"The first was a green glowing disc, the shape was very prominent. We watched in amazement as it travelled from Campbelltown directly over the Cascades and towards Camden. It travelled slowly enough for us to watch it the entire time, never lost its colour or shine and the speed was constant."

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