Explanation:
The snow capped
Teide volcano
is reflected in a pool of water in this
nearly symmetric night sky view from the Canary Island Tenerife.
Bright north star
Polaris stands above the peak in an exposure that
also captures the brilliant trail
of a polar orbiting Iridium satellite.
Of course, with the camera fixed
to a tripod, the stars themselves
produce concentric trails in long exposures, a reflection
of the Earth's rotation around its axis.
In fact, you can add about 4.5 hours of exposure time to this
image by just sliding your cursor over the picture.
Large astronomical
observatories also take advantage of the calm Canary
Island sky.
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