Cloud or UFO? You be the judge.

In this gallery, photographers show us unidentified cloudy objects. These are clouds that look so weird that it's as if some kind of alien vessel shaped them. And who knows? Maybe one did.

One of the truly great things about Flickr is that you can search for "UFO cloud" and get over 6,000 results. Here are some of the weirdest!

Cloud or UFO? You be the judge.

This cloud rises up like a cloaked alien globe behind the Taipei 101 Building in Taiwan. Photo by DragonRal.

Cloud or UFO? You be the judge.

A strange whirling, stack of saucers over Mt. Ranier. Photo by Tonx.

Cloud or UFO? You be the judge.

Seriously what the hell is this inverted, upsidown zuggeraut? Photo by Nonong_O.

Cloud or UFO? You be the judge.

Blood-red lenticular clouds hint at the extraterrestrials' sinister intentions. Photo by gotoabc7.

Cloud or UFO? You be the judge.

UFO attack cloud! Photo by Ethan Hunt.

Cloud or UFO? You be the judge.

Triple-layer alien-sculpted clouds in Highland, California. Photo by Ryan.

Cloud or UFO? You be the judge.

Unidentified extraterrestrial explosion, or just an amazing cloud formation in Alba? Photo by Mandalandala.

Cloud or UFO? You be the judge.

The red ships glower over the terrified landscape. Or maybe it was just a cumulus nimbus cloud? Photo by neofito.

Cloud or UFO? You be the judge.

Flying saucer invasion over France. Photo by Marc Veraart.

Cloud or UFO? You be the judge.

A giant flying saucer! Photo by Richard Nix.

Cloud or UFO? You be the judge.

Another French UFO invasion, this time in southern France. Photo by dumbo.