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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.

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.

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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? 

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.