A simultaneous meteor shower and Earth tremor in the Berwyn Mountains were responsible for an incident dubbed "the Welsh Roswell", according to the Ministry of Defence (MOD), meaning those walking there may not expect to come across any pieces of crashed UFOs.
Freshly-released files state a loud bang and lights in the sky seen in the mountain area just east of Snowdonia on the night of January 23rd 1974 were actually a combination of the two occurrences, not a crashing spacecraft.
RAF aircraft were scrambled from the nearby Valley air base on Anglesey after the report of a loud bang that night, but no wreckage was found.
The MOD said that around 22:00 GMT that night there were three other sightings in different parts of England featuring similar lights.
While it may not have been explored by aliens, people putting on their hiking boots to go walking
in the Berwyns can enjoy the scenery, with the highest peak in the range being Cadair Berwyn at 2,723 ft.
The Roswell incident of 1947, when a UFO was said to have landed in the US, was later blamed on a crashing weather balloon.
Posted by Dan Mirza