A Scottish family captured a remarkable video as a glowing circular UFO hovered above their house for four hours on Thursday.
The flying object - described as 'circular' and covered in 'moving lights' - has baffled UFO experts.
Aviation experts have said that it is unlikely to have been a civilian aircraft - the most common source of 'false positive' sightings of extraterrestrial craft.
Morag Ritchie, 50, from Fraserburgh, Aberdeenshire, was stunned when she was woken suddenly in the middle of the night by flashing lights in the sky above her home.
The grandmother-of-one woke her family up before her daughter's fiancé, Scott Bower, captured the strange object on video.
Morag said: "We live in a very rural area so I never have my curtains closed and I like looking at the night sky.
"I just woke up all of a sudden and looked out of the window to see all these twinkling lights - they looked like they were moving.
"So I got up to the window and from there it looked like some sort of circular object was just hovering and spinning around.
"I was quite apprehensive about it. I'm standing there looking at it and I'm thinking 'is it watching me?'.
"So I went around the house telling everyone and they all came to have a look.
"My husband is a fisherman and he's spent many hours looking up at the night sky, so he was quite sceptical when I told him, but even he admitted it was strange when he saw them.
"Eventually we all went back to bed. I woke up a further two times, the second time was about four hours later and it was still there, but when I next woke up it was daylight and they had gone.
"It was there for so long that even all the way out here, someone else must have seen it, but perhaps they've been too shy to come forward about it."
Morag's daughter, Cara, 27, said she was feeding her baby at 3am on Saturday night when she first heard about the sighting.
She said: "At first I thought it was just a plane, but my mum said it had been there for a few hours and there was no noise or anything.
"I was quite mesmerised by it all to be honest although my fiancé Scott, was pretty scared.
"He was smoking at the back door where you could see the lights from and he was genuinely frightened, he kept the door half open so he wasn't actually fully outside.
"I didn't really believe in UFOs or anything like that beforehand. You hear lots of stories, but you don't really believe them.
"But this was really really strange. After seeing what I've seen, I'm genuinely wondering if there are actually aliens out there now."
Although 95% of all UFO reports can be explained, Scottish UFO expert Malcolm Robinson admitted he was stumped by the footage Scott captured.
He said: "I've looked at the footage and there appears to be four lights in a line intermittently flashing which could be anything.
"But it's strange. Many suspected UFO sightings are actually Chinese lanterns, but it's not them this time - no way.
"It's very interesting to a researcher like me but at the moment we won't have any answers for a couple of weeks at least when I find out if there were any other sightings or aircraft in the area at the time."
Civil Aviation Authority spokesman Tony Finnegan said: "It could be a light aircraft or military aircraft, but at 2am in the morning, it's unlikely to be civilian.
"We aren't able to find out what aircraft were in the area at the time, but there was increased activity of northern lights last week, so I suppose they would be a possibility."