Spilling Thought: It's that time of year again! The nights are dark enough that when a good solar wind is blowing, the #NorthernLights are visible in the sky over #Denali National Park in #Alaska. Here is what the #auroraborealis looked like at 2 am today over the Toklat River. Photo by Daniel A. Leifheit (@danleifheit), #NationalPark Service. by usinterior

Aug 18, 2015

It's that time of year again! The nights are dark enough that when a good solar wind is blowing, the #NorthernLights are visible in the sky over #Denali National Park in #Alaska. Here is what the #auroraborealis looked like at 2 am today over the Toklat River. Photo by Daniel A. Leifheit (@danleifheit), #NationalPark Service. by usinterior

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