'UFO Clouds' Are Real - Here's How They Happen

By Brian Clark Howard
National Geographic
11-9-15

Technically called “lenticular clouds,” the weird phenomenon
seen over Cape Town has a simple explanation

     Social media users in Cape Town, South Africa, posted photos over the weekend that call to mind classic alien invasion movies. The pictures feature eerie, saucer-shaped puffs that seem to hang over the sky like UFOs.

But these so-called “UFO clouds” are nothing to fear.

Meteorologists call them lenticular clouds, which form when strong, moist winds blow over rough terrain, such as mountains or valleys. Picturesque Cape Town is framed by such features, including the 3,500-foot (1,066-meter) Table Mountain. [...]

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Mysterious 'Noctilucent' Clouds Have Returned

By Joe Rao
Space.com
6-22-14

      Earth's polar skies have shined with eerie blue-white glowing clouds slowly twisting and undulating in the twilight sky every summer since the late 19th century.

These mystifying clouds are referred to as night-shining or noctilucent clouds. Such clouds form in an upper layer of the Earth’s atmosphere called the mesosphere during the summer and can be seen from the high latitudes on Earth.

If skywatchers want to possibly see noctilucent clouds, four criteria must be met: The sky must be free of tropospheric ("ordinary") clouds. The region of the atmosphere where they form must be sunlit. This means that the sun must be no more than 16 degrees below the horizon. The background sky must be adequately dark enough for the clouds to stand out. This final requirement means that the sun must be at least 6 degrees below the horizon, what astronomers refer to as the end of civil twilight. Your viewing location should be at a latitude north of 45 degrees, although as you will soon see the clouds have been sighted at more southerly latitudes in recent years.

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By The Huffington Post
1-2-14

    One of the best-studied nearby extrasolar planets — a body just a little larger than Earth — is swaddled in alien clouds, researchers have found. It is the smallest and most Earth-like world yet to yield the secrets of its atmosphere. Another study has found tantalizing hints of clouds on a larger, Neptune-sized world. The pair of discoveries, reported in Nature, suggests that clouds may envelop many exoplanets.

“We always knew the clouds must be there for some planets, but now we have a wave of results telling us that clouds are actually very common,” says Heather Knutson, a planetary astronomer at the California Institute of Technology in Pasadena and lead author of the second paper.

The two planets are among the closest to our Solar System to have been found so far. The super-Earth discovery involves GJ 1214b, just 13 parsecs (about 42 light years) from us, which whirls around a red dwarf star once every 38 hours. As the planet passes across the star’s face, some of the starlight should filter through the planet's atmosphere, revealing its composition. . . .

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