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World UFO Day: What, why and when

On Tuesday, habitual conspiracy theorists celebrate what they believe was a 1947 alien spacecraft crash and US cover-up.

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World UFO Day organisers want to encourage governments to declassify their files on UFO sightings [Getty Images]
Published On 2 Jul 2019

Each summer, the world marks Unidentified Flying Objects Day, or UFO Day.

On Tuesday, habitual conspiracy theorists celebrate what they believe was an alien spacecraft crash and a US government cover-up that allegedly occurred in the summer of 1947, in Rosswell, New Mexico.

But what is the celebration? And who started it? Below is all we know about UFO Day.

What is UFO Day? 

How is the day celebrated?

WATCH: Thousands gather to mark 70th anniversary of ‘Roswell incident’

But was this the first celebration? 

Rosswell project: the key event

What about recent days? 

UFO day
A purported top secret UFO hidden and covered inside a hangar [File: Getty Images]

What do other US presidents have to say about this?

US presidents have been known to talk about the subject of UFOs and the Roswell incident.