A bizarre giant pyramid-shaped UFO has appeared over Moscow's Kremlin where it is said to have hovered for several hours.

Videos of the flying object - which some claim is about a mile wide - have been posted to YouTube where they have been watched by thousands of people.

Some UFO experts claim the clips make compelling viewing and are the closest anyone has come to proving that aliens have visited the earth.

However, more cynically minded theorists suggest it could be an odd shaped hot air balloon or even a hologram.

As the good people of Moscow haven't all run screaming into the night we are tempted to think it may not be an alien craft. What do you think? Let us know in the comments.

It is a disappearance almost worthy of Mulder and Scully. After almost 60 years investigating the UFO threat over Britain - the MoD 'X Files' bureau has been axed.

Earlier this week the UK Ministry of Defence quietly cut their hotline for members of the public to report UFO sightings.

And it wasn't because no-one was calling - the line has received more than 12,000 UFO and alien reports since it was launched in 1950, including 135 last year.

The reports were all investigated and despite the MoD admitting that five percent could not be explained,  they say they do not think they are worth investigating any more.

So what do you think, is this part of a cover-up, have they already made contact with aliens so no longer need the sighting reported… or have we been watching too many sci-fi movies? 

The Vatican's top astronomer has claimed aliens could exist and that this does not conflict with religious beliefs.

Speaking at a Vatican conference on extraterrestrial life Rev. Jose Funes said astrobiology was a valid area of research for the church.

The five-day event had been attended by 30 high-level scientists including astronomers, geologists, biologists and physicists.

Fune concluded the event saying that just because there was no hard evidence of ET didn't mean that aliens don't exist and that people shouldn't believe.

It is a good job he doesn't think "hard evidence" is a prerequisite for belief … otherwise he could be in the wrong job.