Clouds: They’re New & Blue
Global warming may have created a new type of cloud called noctilucent or “night shining” clouds (NLCs). They’re thin and wispy and have an electric blue glow. “Over the past few weeks we’ve been enjoying outstanding views of these clouds above the southern hemisphere,” says space station astronaut Don Pettit. “We routinely see them when we’re flying over Australia and the tip of South America.” He estimates they?re 50 to 62 miles above the Earth’s surface, “literally on the fringes of space.” You can see them from Earth as well, glowing in the night sky after sunset.
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