NOCTILUCENT CLOUDS ARE MISSING: Something strange is happening 50 miles above Antarctica. Or rather, not happening. Meteoritic noctilucent clouds, which normally blanket the frozen continent at this time of year, are almost completely missing. Find out why on today's edition of Spaceweather.com.
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Above: Last year vs. this year. These images from NASA's AIM spacecraft show how noctilucent clouds over Antarctica are missing in 2020.
