This weekend Britain’s oldest UFO group turns 50. That's half a century of aliens, unidentified flying objects and scientific research, courtesy of The British UFO Research Association.

We've already given ten reasons why we believe in alien life. Here are ten reasons why we don't.

1. Fuzzy footage of what was claimed to the shrivelled up corpse of an alien emerged in Russia last year.

The film quickly went viral, although the “body” looked suspiciously like a rubber doll. It was located in the town of Irkutsk, not far from an alleged UFO sighting in Siberia a month earlier. It later emerged the "body" was not even made of rubber - rather it had been fashioned out of bread, chicken and blood. Delicious.

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The Irkutsk alien looked suspiciously like a rubber doll

2. A UFO was apparently filmed hovering above the London 2012 Olympic Opening ceremony in July.

A disc-shaped object appeared above the stadium, travelling across the length of it before apparently disappearing. Rather than beings from another planet showing up for a glimpse of the greatest show on earth, the mystery of the UFO was solved after the craft was identified as a Goodyear blimp.

3. It's the last thing on earth you'd want to see in your fridge, but it's exactly what Marta Yegorovnam says had on the shelf above the butter and cheese for two years.

She claimed to have retrieved the alien corpse after it's craft crashed near her home in Petrozavodsk, Russia. Except it was probably just a rotten bag of vegetables. Sorry Marta.

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The spectacle of this 'craft' hovering above a cathedral in New Orleans caused a commotion

4. 35 witnesses reported seeing blue UFOs flying above Leicestershire in September. After weeks of research and dozens of witness interviews, the flashing lights, which had been reported as "behaving strangely", were revealed to be quadrocopters (model helicopters with four small rotor supports arranged in a cross shape).

5. A strange, mushroom-shaped object found at the bottom of the Baltic Sea was at first believed to be a UFO that crashed in the waters between Sweden and Finland. Extra-terrestrial speculation soon evaporated, only to be replaced with talk of Nazi secret anti-submarine devices.

6. During a Colt-Saints game in New Orleans last October, brightly lit objects were seen streaking across the sky during a 29-shot of the historic St Louis Cathedral. A home viewer videotaped the NBC footage and slowed it down, even to frame-by-frame examination, it appeared that the NBC camera had captured a very large, rod-shaped object topped with glowing circular lights and moving behind the cathedral. Alien football fans became a hot topic and the video went viral...before the original cameraman came forward to reveal just what was occurring in the footage.

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NBC cameraman R.D. Willis told The Huffington Post that because he taped the sequence at super-slow speeds, the objects just seem to be lightning-fast spacecraft. Yet, the objects in question were commercial airplanes.

7. Glowing lights in the skies above northern Utah last year stopped traffic and even saw the police become involved. Speculation as to the nature of the lights was ramped up as a nearby Air Force base denied holding training exercises and cover-up rumours began to come thick and fast.

Disappointingly, the eerie lights had a simple explanation - they were Chinese lanterns launched by students at Bonneville High School. Whether launched by hoaxers or just in the name of innocent fun, Chinese lanterns continue to be one of the most common culprits in UFO sightings.

8. A UFO was spotted hovering above the Dome of the Rock, an ancient Islamic shrine in Jerusalem in January last year. The glowing orb flashed briefly before taking off and disappearing, in a video apparently shot by American tourists.

Religiously inclined aliens were an interesting concept, but, as Benjamin Radford, of Discovery News, points out: "For what is described to be (and seems to be) a brightly glowing object, it does not appear to reflect any light off the top of the Dome, which it hovers directly above."

9. Another comically fake sighting was reported by four teenagers in Panama in 2009. A photograph revealed a creature with an small head, a strange, pasty body, with skinny, human-like arms. The teens claimed it had been alive when they encountered it, but that it started coming after them, so they killed it with rocks and stones. The creature in question was later identified as a sloth.

10. A security video taken at a town square in Jakarta, Indonesia, appeared to show what YouTube users described as an "angel-like spirit" flying in to view. A group of torch-bearing people storm the area where the winged being appeared, seemingly investigating the strange sight.

The "pulsating" burst of light was speculated to be extra-terrestrial by many, but a Huffington Post poll saw 64.91 per cent of readers declare it a hoax. So there you go.

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  • Roswell

    America's most infamous UFO case centers in Roswell, N.M. Some people claimed an alien spacecraft crashed there in 1947; the military said it was a weather balloon.

  • Roswell dummies

    The Air Force issued "The Roswell Report" in 1997. Countering claims that aliens were recovered at the New Mexico site, the report said military officials picked up 200-pound dummies, above, that were used in an experiment.

  • Sunken Ship in the Baltic Sea

    On June 19th the Swedish-based diving company Ocean Explorer discovered something they've never quite seen before. They were exploring in the Baltic Sea between Sweden and Finland looking for sunken treasures when a very unusual image suddenly appeared on the sonar. A 197 feet diameter cylinder shaped object was discovered at the depth of approximately 275 feet which resembles the Millennium Falcon from the movie Star Wars.

  • UFO Over Mojave Desert Sept. 9, 1985

    This cigar-shaped UFO was photographed by general aviation pilot David Hastings as he piloted a Cessna Skymaster plane over the Mojave Desert on Sept. 9, 1985. There has never been an indication of hoax in this case, which remains unexplained to this day.

  • UFO Over Holloman Base

    An unidentified flying object was photographed by a government employee over the Holloman Air Development Center in New Mexico in 1964. Conspiracy theorists have claimed the photo is proof that the U.S. government has been in contact with aliens.

  • Strange objects over France

    While descending an Austrian mountain in 1954, photographer Erich Kaiser captured an image of what he called mysterious silvery-white flying objects.

  • Mexican Air Force Pilots Video

    Mexican Air Force pilots filmed strange, brightly lit objects that moved quickly in the skies on March 5, 2004. Some scientists said the phenomenon could have been caused by gases in the atmosphere.

  • Alien in Brazil

    Video grab close up. What looks like an alien creature with visible head, neck, arms and body standing in the Brazilian rainforest in Manaus, Brazil. In this Amaz-alien footage, a lone unidentified being appears to stand in the jungle of Brazil -- even arching its back -- just feet away from a bright flashing blue light. In what some allege as proof that Earth is being visited by aliens from another planet, the video was obtained by paranormal writer Mike Cohen who says the video was taken by two British tourists visiting the Manaus region of the Amazon jungle.

  • Crop Circle in Yogyakarta, Indonesia

    A large circle and geometric pattern local residents say were created by a UFO appeared in a rice field in Krasakan hamlet in Sleman, Yogyakarta, on the morning of Jan. 23, 2011.

  • Stan Romanek film

    Stan Romanek claimed that this still image from a three-minute video he shot in 2003 shows an alien looking into his home in Nebraska. In the film, a strange face appears to be popping up and down outside Romanek's window.

  • Sketch of UFO sighting

    This eyewitness drawing of an alleged UFO sighting is in one of 19 once-secret files posted to the British National Archives website. The files cover sightings reported between 1986 and 1992. Although many of the reports were debunked, some remain unexplained.

  • France field markings

    An investigator in 1989 measures markings that some said were left behind by a UFO in Normandy, France. France began releasing its "X-Files" on UFO sightings in 2007.

  • President Jimmy Carter

    President Jimmy Carter, shown here in 1971, reported that he saw a UFO above Leary, Ga., in 1969. He filed a report about the sighting to the International UFO Bureau in 1973.

  • Astronaut Gordon Cooper

    Astronaut Gordon Cooper, who piloted Mercury and Gemini space missions in the 1960s, once said he saw a "typical saucer shape, double-cylindrical shape, metallic" UFO. He was also outspoken on the idea that some UFOs were interplanetary vehicles visiting Earth.

  • Area 51

    At sunset military aircraft contrails in the skies above Area 51 and the U.S.Air Force air weapons range near the town of Rachel and the UFO Highway (hwy. 375) . (CP PHOTO/Larry MacDougal)

  • Monkey Alien

    A preserved monkey is shown on display in the lobby of the Georgia Bureau of Investigation Crime Lab Thursday July 24, 2008. in Decatur, Ga. The shaved monkey was part of a 1953 UFO hoax in rural Cobb County. (AP Photo/John Bazemore)

  • Alien

    Alien created for the Showtime movie "Roswell, " and is purported to be a likeness of the alien allegedly found in a crashed 'spaceship' in Roswell, New Mexico in the 1950's. (Photo credit: PA)

  • UFO

    Unidentified Flying Object sighted over New Zealand's South Island on Jan. 3, 1979. New Zealand television crew cameraman Frank Kazukaitis said of the sighting, "It looked like an illuminated ping pong ball with a tinge of red in the middle." (AP Photo/Dominion)

  • ET Vistor Center

    World reception center for official visitors from outer space was proposed by an American specialist on unidentified flying objects (UFOs). Hungarian-born Colman von Keviczky, a former United Nations official, right, for the effective solution of the global problem. (Photo credit: PA)

  • UFO

    This photograph was taken by a tourist and shows an Unidentified Flying Object, flying over Romanian territory near Cluj town Sept. 24. 1968. (AP Photo)

  • UFO

    Engineer Reg Willard (left) chips away with a chisel as he dissects the bleep mechansim of the mystery object found at Clevedon, Somerset, by a schoolboy. Helping him is Aubrey Willcocks, who was called in by the local police. Looking on is Sergeant John Durston. The object was one of five strange objects, all resembling flying saucers and emitting noises, found in different parts of the country. Inside the object Mr Willard found two Exide batteries, a British made transmitter and a loudspeaker. (Photo credit: PA)

  • UFO

    Engineer Michael J Willcocks applies the taste test to the liquid found in the mystery object found at Clevedon, Somerset, by a schoolboy. The liquid was later identified as pig swill. The object was one of five strange objects, all resembling flying saucers and emitting noises, found in different parts of the country. (Photo credit: PA)

  • UFO

    This is one of three photos of a supposed UFO taken by Rex Heflin, Mar. 28, 1967, Santa Ana, Calif. Heflin is an Orange County highway department investigator. (AP Photo)

  • Pancake-like objects

    Joseph Simonton, 60 of Eagle River display one of three pancake-like objects, he says were given to him on Saturday by the operator of a 'flying saucer'

  • UFO

    Pickaway County Deputy Sheriff John Wolford supervises the loading of a part from an Air Force balloon that descended from the sky in south central Ohio farmland, April 19, 1966. The balloons, devices and a 4,500-pound payload apparatus, launched at Holoman Air Force Base, N.M., came down in two sections about 15 miles apart. (AP Photo)

  • Northwestern University Astrophysicist, J. Allen Hynek, shown at a press conference, March 25, 1966, Detroit, Mi. A newsman handed this photo to Hynek and asked him if it was a flying saucer. Hynek described it as a chicken feeder and said that numerous sightings of recent unidentified flying objects in Michigan were probably the result of swamp gasses and not visitors from outer space. Hynek has studied and investigated UFOs for the past 15 years. (AP Photo/ Alvin Quinn)

  • UFO

    Michael Savage, 15-year-old son of prominent San Bernardino physician and surgeon, was practicing picture-taking with his new camera, when he saw motion out of the corner of his eye Thursday, July 24, 1956, San Bernardino, Calif. He quickly shot this picture, tried to shoot another and in his haste over-cranked the camera, drawing a blank with his second shot. The object disappeared in 30 seconds, he said, not over the horizon but quickly out of sight in the sky. (AP Photo/Michael Savage)

  • White UFOs

    This photograph, reproduced from the quarterly UFO periodical Flying Saucers International in Los Angeles, shows silvery white flying objects as seen by photographer Erich Kaiser while descending from Reichenstein mountain in Austria on Aug. 3, 1954. (AP Photo)

  • UFO Crash

    A wrecked wind turbine on farm land in the village of Conisholme, Lincolnshire. The mysterious severance of the wind turbine blade may have been caused by a mechanical failure, an expert said today. Local residents reported seeing a bright light on the morning it happened, prompting speculation that a UFO had caused the damage. But Fraser McLachlan, chief executive of GCube, which insures more than 25,000 wind turbines worldwide, said that although it is unusual, this type of incident happens about five or six times a year. (Photo credit: Chris Radburn/PA Wire)

  • UFO Advert

    An Advertisment for the Irish UFO Society which appears in the 2007 Association of Garda Sergeants and Inspectors Diary. (Photo credit: Niall Carson/PA)

  • Dead Cattle

    Rachel, Nevada, Near Las Vegas on the UFO Highway (hwy 375) at the town of Rachel, dead livestock (cattle) beside the highway. Rachel is near Area 51 which is contained within the U.S.Air Force weapons range. (CP PHOTO/Larry MacDougal)

  • Space Man

    Police Officer Jeff Greenhaw took these pictures of a strange looking creature he said he found standing in the middle of a major highway which runs thru his town, Wednesday, Oct. 18, 1973, Huntsville, Al. (AP Photo/Jeff Greenhaw)

  • Cigar

    Texas farmer Carrell Wayne Watts told a polygraph operator this Polaroid snap shows an alien spacecraft 80 to 100 feet long, Sunday, Feb. 25, 1968, Amarillo, Tx. The Houston Post will release results of 29-year-old Watts lie test late Sunday night. (AP Photo/Carrell Wayne Watts)

  • Strange noises

    One of the strange objects, all resembling flying saucers and emitting noises, found in different parts of Britain. This one was found at Chippenham, Wiltshire. (Photo credit: PA)

  • Civilian or Military Aircraft

    Civilian or military aircraft: Planes can look mysterious at night or in certain light conditions, thus confusing an observer.

  • Meteors

    Meteors: Space debris can create a spectacular light show when it burns through the Earth's atmosphere, and sometimes reported as UFOs.

  • Manufactured UFO -- 2011

    Pictured is a quad copter -- a deliberately manufactured UFO created by special effects wizard Marc Dantonio for a National Geographic special, "The Truth Behind: UFOs," which aired in December 2011. On the left is what the small device looks like resting on the ground, measuring 4 feet in circumference. At right, is how it appeared behind a tree in the night sky.

  • Antarctic UFO Closeup -- Aug. 10, 2012

    This is a closeup of the UFO from the previous slide. No official explanation has been offered about the object.

  • Antarctic UFO -- Aug. 10, 2012

    A circular UFO hovers above the Neumayer-Station III research facility in Antarctica on Aug. 10, 2012. Theories ranging from a simple weather balloon to a more elaborate ship from another planet have run the Internet gamut. The next slide shows a closeup of the object.

  • Lanterns

    These candle-lit Chinese lanterns can rise high into the sky and were mistaken for UFOs in England.

  • Baltic Sea UFO 3

    One of several odd stone circle formations, sitting on top of the unidentified object at the bottom of the Baltic Sea.

  • Baltic Sea UFO 2

    Close-up of rock bed that forms the Baltic Sea UFO, which still mystifies researchers.

  • Baltic Sea UFO 1

    An image released on June 15, 2012, shows a close-up view of the unidentified object sitting on the bottom of the Baltic Sea.

  • Blimps or Advertising Balloons

    Blimps or advertising balloons: These can look like flying saucers from some angles, especially at night.

  • Clouds

    Clouds: Saucer-shaped or "lenticular" clouds that form at high altitudes have been confused with UFOs.

  • Weather Phenomenon

    Some UFO sightings may be due to a natural phenomenon known as sprites, like this one shown from 2006. "Lightning from [a] thunderstorm excites the electric field above, producing a flash of light called a sprite," said geophysicist Colin Price.