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Earth's highest, coldest, rarest clouds are back. How to see the eerie 'noctilucent clouds' this summer.Look North as the stars appear in June and July to have a chance of seeing rare noctilucent (or 'night-shining') clouds with the naked eye.
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What happens if you skydive through a cloud?What it's like to skydive through a cloud depends in part on the type of cloud, but regardless, you'll likely end up cold and wet.
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See the first clear images of 'sun rays' on Mars in eerie new NASA photosThe rays appear when sunlight shines through gaps in the cloud during sunrise or sunset and have never been seen this clearly on the Red Planet before.
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Ultra-rare 'rainbow clouds' light up the Arctic Circle like auroras in stunning new photosRare clouds that give off bright, multi-colored light like an aurora were recently spotted at multiple locations in the Arctic. But what causes them?
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How much does a cloud weigh?Clouds look light and fluffy, but they're surprisingly heavy.
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Sea Creatures Make Brighter Clouds to Cool the Earth -
Bizarre 'Levanter' cloud billows off Rock of Gibraltar in breathtaking time-lapse videoA new time-lapse video shows an unusual banner cloud, known locally as "The Levanter," forming on the peak of the Rock of Gibraltar.
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Striking satellite photo captures Mount Vesuvius peering through a hole in the cloudsA satellite image captured by Landsat 8 shows Mount Vesuvius "peering" through an eerily circular hole in the clouds.
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Striking bull's-eye-shaped clouds form above erupting La Palma volcanoSatellite images released by NASA's Earth Observatory show concentric rings of clouds forming above the erupting volcano on La Palma in the Canary Islands.
