That was the question Alan Ferguson was asking after taking these pictures at Acacia Hills.

Mr Ferguson, 43, said he was taking pictures of the sky about two weeks ago, but when he downloaded the snaps he noticed a strange object flying among the clouds.

And Mr Ferguson is convinced it could be a sign that life exists beyond the Earth's limits.

"I have been seeing these weird and wonderful things flying around the place for years and no one believes me,'' he said.

Asked if he thought the object was a UFO, Mr Ferguson said: "It's a possibility... we can't be the only people running around.''

Mr Ferguson said he was convinced the object was metallic because he said the sun could be seen reflecting off it.

He said for the past three years he had seen objects moving in the shape of an "N'' at great speed in the sky above his home.

"You picture the letter N in your head, that's the manoeuvre they can make in a split second,'' he said.

UFO spotting has been a regular occurrence in the Territory.

Last month residents at the tiny town of Marlinja, 730km south of Darwin, reported seeing four UFOs.

MYSTERIOUS: These pictures taken by Mr Alan Ferguson clearly show there was something in the air that day.

The object encircled by clouds.

Another magnified close-up of the object.