by APOD Robot » Tue Apr 23, 2024 4:07 am
Contrail Shadow X
Explanation: What created this giant X in the clouds? It was the shadow of
contrails illuminated from below. When airplanes fly, humid
engine exhaust may form water droplets that might freeze in Earth's
cold upper atmosphere. These persistent
streams of water and ice scatter light from the
Sun above and so appear
bright from below. On rare occasions, though, when the Sun is near the horizon,
contrails can be lit from below. These contrails cast long shadows upwards, shadows that usually go unseen unless there is a high cloud deck. But that was just the case over
Istanbul,
Türkiye, earlier this month. Contrails occur
all over planet Earth and, generally,
warm the Earth when the trap
infrared light but cool the Earth when they efficiently reflect
sunlight. The image was taken by a surprised photographer in the morning
on the way to work.
[url=https://apod.nasa.gov/apod/ap240423.html] [img]https://apod.nasa.gov/apod/calendar/S_240423.jpg[/img] [size=150]Contrail Shadow X[/size][/url]
[b] Explanation: [/b] What created this giant X in the clouds? It was the shadow of [url=https://en.wikipedia.org/wiki/Contrail]contrails[/url] illuminated from below. When airplanes fly, humid [url=https://www.grc.nasa.gov/www/k-12/UEET/StudentSite/engines.html]engine[/url] exhaust may form water droplets that might freeze in Earth's [url=https://cloud1.arc.nasa.gov/solveII/outreach/middleschool-atmos.htm]cold upper atmosphere[/url]. These persistent [url=https://apod.nasa.gov/apod/ap231204.html]streams of water and ice[/url] scatter light from the [url=https://science.nasa.gov/sun/]Sun[/url] above and so appear [url=https://apod.nasa.gov/apod/ap050513.html]bright from below[/url]. On rare occasions, though, when the Sun is near the horizon, [url=https://www.nasa.gov/wp-content/uploads/2023/06/contrails-k-12.pdf?emrc=9d8066]contrails[/url] can be lit from below. These contrails cast long shadows upwards, shadows that usually go unseen unless there is a high cloud deck. But that was just the case over [url=https://youtu.be/eV6lTEY95yY]Istanbul[/url], [url=https://en.wikipedia.org/wiki/Turkey]Türkiye[/url], earlier this month. Contrails occur [url=https://apod.nasa.gov/apod/ap080429.html]all over[/url] planet Earth and, generally, [url=https://baltimorefishbowl.com/wp-content/uploads/2014/03/catsburritoscoldkittenswrapburrito-03bc734d15d3f1eed350fa0b20e309ed_h.jpg]warm[/url] the Earth when the trap [url=https://science.nasa.gov/ems/07_infraredwaves/]infrared light[/url] but cool the Earth when they efficiently reflect [url=https://apod.nasa.gov/apod/ap230611.html]sunlight[/url]. The image was taken by a surprised photographer in the morning [url=https://apod.nasa.gov/apod/ap200224.html]on the way to work[/url].
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