The mystery behind UFOs has captivated people for generations but the US government has claimed they've solved the majority cases putting them down to airborne clutter from weather balloons to surveillance operations by foreign powers.
Despite this not all images and footage of UFOs have been fully debunked.
In an attempt to demystify the phenomena, government officials even gone as far to use the term “unidentified aerial phenomenon” to replace the acronym UFO, which has connotations of flying saucers and visiting space aliens.
While reports and sightings have been investigated by American intelligence agencies and the Pentagon, officials have confirmed that most of the incidents can be accounted for with ordinary explanations.
For example, earlier this year, footage of green triangles in the sky that looked like alien spacecraft was published. Upon investigation, the triangles were actually drones that had been photographed through night-vision lenses, reports the Daily Star.
Details surrounding the time and place of where the images were taken have not been disclosed. However, military officials have confirmed that they are an attempt to conduct surveillance on military manoeuvres.
In another separate video reviewed by the military, an object could be seen moving through the sky at speed. It was explained to be an optical illusion, created by the angle from which the object was observed against the water. The Pentagon also confirmed that the speed of the object was around 30mph.
And another instance of footage, which featured an object which appeared to be turning or spinning was debunked due to the optics of the classified image sensor.
However, not all images and footage reviewed by the military have a concrete determination. In that case, officials are confident that the technology is not alien.
In May, Pentagon officials testified under oath that the government had not collected materials from any alien landing on Earth.
