A spectacular manifestation of the Aurora Borealis this month in Iceland. The Medieval Vikings might have interpreted this as a sign from the gods. But no: science. To wit:

The aurora was caused by a hole in the Sun’s corona that expelled charged particles into a solar wind that followed a changing interplanetary magnetic field to Earth’s magnetosphere.

Still.

Sky Dragon!

(Pic: Zingyi & Wang Zang)

apod

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