Credit & Copyright: Alex Cherney (Terrastro, TWAN)
Explanation: Why would the sky glow red? Aurora. Last week’s solar storms, emanating mostly from active sunspot region 1402, showered particles on the Earth that excited oxygen atoms high in the Earth’s atmosphere. As the excited element’s electrons fell back to their ground state, they emitted a red glow. Were oxygen atoms lower in Earth’s atmosphere excited, the glow would be predominantly green. Pictured above, this high red aurora is visible just above the horizon last week near Flinders, Victoria, Australia.
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