An image taken from orbit that was featured on NASA's website shows a potentially otherworldly extra.
Gary Heseltine spoke to six former US congressmen at the National Press Club in Washington.
Two separate witnesses have reported seeing a large triangular UFO within the space of two hours.
Two pilots of a passenger plane have reported almost colliding with an unknown object over Scotland.
Groups of strange bright circular objects have been filmed flying in formation in the skies over Ireland.
A former KGB agent has revealed details of Soviet studies and experiments relating to UFOs.
Hollywood movies involving UFOs and aliens could have a direct effect on the number of real-life reports.
Since being released under the Freedom of Information Act, the memo has been viewed 1 million times.
A MUFON report has described an unusual sighting that took place over Lowe Farm, Manitoba a week ago.
Reports of objects in the skies over the Cape Town coast have been on the increase in recent weeks.
The Canadian government is no longer investigating UFO reports according to newly released documents.
Actor Russell Crowe believes he has caught a UFO on film flying over Sydney's Botanical Gardens.
Filmmaker James Fox will award the money to anyone who can prove that some UFOs are alien in origin.
An increasing number of videos and stills showing unknown objects around the ISS have appeared on-line.
A clear photograph of a strange object hovering in the skies over Seattle has been circulating on-line.
A vast 230ft airship may soon replace conventional aircraft for hauling cargo over long distances.
A UFO group in Taiwan is attempting to authenticate an image taken at a hiking site by a policeman.
Mauricio Ruiz managed to record an anomalous object from his window during a flight to Chicago.
A policeman has reported seeing a UFO moving at supersonic speeds while he was off duty in Birmingham.
Officials in Britain have opted to drop all charges after a legal battle lasting more than a decade.