Rare noctilucent clouds are showing up in places they never used to, and scientists are trying to find out why.

When clouds are both noctilucent and iridescent, they're called nacreous clouds, and under the right conditions, noctilucent clouds can take on an iridescent, mother-of-pearl quality. The ...

Known as "nacreous clouds" or "mother-of-pearl clouds," these clouds are a very rare phenomenon. Captured on Jan. 12, when the sun was located just below the horizon, the unforgettable appearance ...

Nacreous clouds, or ice polar stratospheric clouds, are a rare type of cloud that forms in very cold conditions and at high altitudes. They are known for their iridescent colors, which are created ...

Because nacreous clouds can only exist in such frigid conditions, they’re not often seen outside polar regions. But not often isn’t never—and observations of nacreous clouds in southern ...

Several people across the country were treated to views of the colourful nacreous clouds. Residents across Scotland witnessed a rare, natural light show with shimmering rainbow clouds in the sky.

People in parts of Scotland last week got to witness a rare, natural light show with shimmering rainbow clouds in the sky. Stunning footage that has gone viral online shows iridescent clouds in ...

The clouds, which also go by the name of nacreous clouds, appear only in extremely cold weather. They are created by tiny ice crystals that scatter sunlight creating little rainbows in the sky.

Rare nacreous clouds, known as rainbow clouds, form in the skies over Tynemouth Priory in the northeast of England on Dec. 21, 2023. / Credit: Owen Humphreys/PA Images via Getty Images "I was ...

"I was lucky enough to spend time with some very rare nacreous clouds this morning appearing & evanescing near Swords, north county Dublin," said one person who posted a video of the clouds on ...

These rare 'rainbow clouds' have been making an appearance across the UK for the past couple of days. They are Nacreous clouds which form in -80C air with tiny ice crystals that refract the sunlight." ...

They look like a stunning Impressionist masterpiece or mother of pearl in the sky. And while nacreous clouds are usually a rare sight in the UK, they've been spotted across Britain this week.