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Astronomy Picture of the Day
Noctilucent Clouds
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#75639
by
[z]Barbara Harris
@
20.06.2005 00:00
- nach oben -
Noctilucent Clouds
Explanation:
Sometimes it's night on the ground but day in the air.
As the Earth rotates to eclipse the Sun,
sunset
rises up from the ground.
Therefore, at sunset on the ground,
sunlight still shines on
clouds
above.
Under usual circumstances, a
pretty sunset
might be visible, but unusual
noctilucent clouds
float so high up they
can be seen well after dark.
Pictured above
, a network of
noctilucent clouds
casts a colorful but eerie glow
visible above the dark.
Although
noctilucent clouds
are thought to be composed of
small ice-coated particles,
much remains unknown
about them.
Recent evidence
indicates that at least some
noctilucent clouds
result from freezing water exhaust from
Space Shuttle
s.
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