Earth's highest, coldest, rarest clouds are back. How to see the eerie 'noctilucent clouds' this summer.

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Earth's highest, coldest, rarest clouds are back. How to see the eerie 'noctilucent clouds' this summer.
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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.

Look up an hour or two after sunset and before sunrise over the next few months and you may see ethereal blue, silver or golden streaks in the Northern Hemisphere's northern skies.

Called noctilucent clouds ) or NLCs, these strange-looking patterns in the sky are the highest, driest, coldest and rarest clouds on Earth, according to a 2018 study of the phenomenon. These shimmering, night-shining clouds appear in the mesosphere — a layer of Earth's atmosphere above the stratosphere and below the thermosphere, about 47 to 53 miles above Earth's surface. Sometimes dubbed"space clouds," NLCs form just below the invisible boundary where Earth's atmosphere ends and outer space begins, roughly 62 miles above the planet's surface, according to NASA.

NLC sightings were at a 15-year high last summer, according to the Washington Post. Sightings have become more frequent in recent years and at lower latitudes, possibly because climate change generates more water vapor in the atmosphere as a result of increased atmospheric methane, according to NOAA.

For the best chance to see some NLCs in the evening, you'll need a good view low to the northern horizon as the stars begin to shine in late twilight. It's typical to see displays in the bottom 20 to 25 degrees of the northern sky, according to Sky & Telescope.

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