STUNNING photographs have captured a rare "rectangular" moon which appeared in the night sky this week.

The stunning natural wonder was caused by a perfect combination of warm and cold air meeting just above the sea.

4 John Stetson took this incredible picture from Casco Bay, Maine on 9 July 2017

"The rising moon looked like an iceberg ... faint and shaped like a giant block of ice," John Stetson told Spaceweather.com.

Stetson took the incredible snap while gazing out of Casco Bay in Maine on 9 July.

The photo, which was shared on Facebook, has sparked several alien conspiracies are but there are a few scientific theories for the natural wonder.

The cold sea cooled the air above it, which affected a pocket of higher warmer air.

The rays pass through this inverted air and its bent and twisted into strange images - combining to create the "iceberg" you can see in the snap.

4 'Rectangular moon' spotted near Cape Elizabeth, Maine near Two Lights State Park on 10 July 2017 Credit: John Stetson

4 The amazing pink and orange cloud was spotted hovering above ski resorts in Sweden Credit: Instagram/ lorenzotti

But the bizarre lunar spectacle occurred again on 10 July, and scientists reckon it could be down to the Earth's atmosphere acting as a lens.

It’s the latest in incredible natural events that have been spotted recently – some which are yet to be explained by science

4 Rather than being extra-terrestrial, they are actually formed by hot air condensing over mountain peaks Credit: Instagram/ @annavarg1

One man spotted multi-coloured laser beams shooting down from the sky, and a rare fog bow spotted on the Scottish mountains.

A mysterious cloud-shaped UFO was spotted over a Californian beach earlier this year.

Incredible pictures show the moment the clouds parted as though a spaceship was about to makes its descent into Huntingdon Beach on the west coast.

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