Cave with Aurora Skylight 

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Image Credit & Copyright: Ingólfur Bjargmundsson

 Yes, but have you ever seen aurora from a cave? To capture this fascinating juxtaposition between below and above, astrophotographer Bjargmundsson spent much of a night alone in the kilometer-longRaufarhólshellir lava cave in Iceland during late March. There, he took separate images of three parts of the cave using a strobe for illumination. He also took a deep image of the sky to capture faint aurora, and digitally combined the four images later. The 4600-year old lava tube has several skylights under which stone rubble and snow have accumulated. Oh — the person standing on each mound — it’s the artist.

APOD NASA 22-Jul-2014