NOCTILUCENT CLOUDS OVER ARGENTINA: Noctilucent clouds (NLCs) are behaving strangely. Missing for more than a month, the meteoritic, night-shining clouds have suddenly returned and made a surprise appearance in Argentina. Sky watchers in the southern hemisphere may have a rare chance to see NLCs with their own eyes. For the full story, visit Spaceweather.com.
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Above: Laser radar echoes from noctilucent clouds floating 80 km above Argentina on Jan. 3, 2021.
