One of the space agency's recent 'picture of the day' posts reads 'flying saucer crash lands in Utah Desert'.
A miniature UFO that allegedly crashed in Yorkshire in 1957 has been rediscovered inside a museum archive.
A mysterious visitor to a library in Ohio has been leaving dozens of empty sauce bottles on the shelves.
Marine biologists have recorded footage of a remarkable jellyfish in the depths of the South Pacific.
It's a question that has puzzled mankind for years - how do you get every drop of sauce out of the bottle?
The town has long refused to lift a ban on UFOs following a mysterious encounter over 60 years ago.
Two witnesses described seeing a large circular craft flying above a Scottish beach on Friday morning.
YouTuber Cemre Candar decided it would be a good idea to jump in to a bathtub filled with spicy sauce.
Motorists in Ireland were left perplexed when a flying saucer was seen casually driving along the road.
Footage has surfaced online of a truck hauling what looks like a flying saucer along a US highway.
The model craft was loaded on to a truck by thieves last Saturday before being dumped in nearby woods.
An investigation was conducted by authorities in Brazil following a spate of UFO 'attacks' in 1977.
The space agency will be testing out its futuristic Mars landing system over Hawaii this week.
The strange saucer-shaped object was picked up on video as it passed over a residential area.
German pilot Manfred Freiherr von Richthofen allegedly shot down a 'silver saucer' over Belgium.
A strange saucer-shaped object has been dug up by miners during excavation work in Siberia.
The space agency has released new video footage from its LDSD test flight back at the end of June.
An experimental saucer-shaped vehicle designed to be used on Mars has undergone a successful test flight.
Amateur pilot Kenneth Arnold kick-started the modern UFO phenomenon after a sighting back in 1947.
Retired engineer Duan Phillips has spent the last 15 years constructing a saucer-shaped flying vehicle.