As the late summer sun sets in the Arctic, bands of wispy, luminescent clouds shine against the deep blue of the northern sky.
To the casual observer, they may simply be a curiosity, dismissed as the waning light of the midnight sun. But to scientists, these noctilucent ice clouds could be an upper-atmospheric symptom of a changing climate.
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©Richard Collins, UAF Geophysical Institute
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Noctilucent clouds shine in the dark portion of the sky in this image taken from the Poker Flat Research Range in 2005.
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Comment: A footprint - in the mud - in the egyptian desert? For years Hawass has been denying the possibilities of water marks on the sides of the sphinx. Will this convince him to review the evidence?