by APOD Robot » Wed Oct 25, 2023 4:05 am
Gone in 60 Seconds: A Green Flash Sunset
Explanation: In 60 seconds, this setting Sun will turn green. Actually, the top of
the Sun already appears not only green, but wavey -- along with all of its edges. The Sun itself is unchanged -- both
effects are caused by looking along hot and cold layers in
Earth's atmosphere. The unusual color is known as a
green flash and occurs because these atmospheric layers not only shift background images but disperse colors into slightly different directions, like a
prism. The featured video was captured earlier this month off the coast of
Hawaii,
USA. After
waiting those 60 seconds, at the video's end, the upper part of
the Sun seems to hover alone in space, while turning not only
green, but
blue. Then suddenly, the Sun appears to shrink to nothing -- only to return tomorrow.
[url=https://apod.nasa.gov/apod/ap231025.html] [img]https://apod.nasa.gov/apod/calendar/S_231025.jpg[/img] [size=150]Gone in 60 Seconds: A Green Flash Sunset[/size][/url]
[b] Explanation: [/b] In 60 seconds, this setting Sun will turn green. Actually, the top of [url=https://science.nasa.gov/sun/]the Sun[/url] already appears not only green, but wavey -- along with all of its edges. The Sun itself is unchanged -- both [url=https://apod.nasa.gov/apod/ap090223.html]effects[/url] are caused by looking along hot and cold layers in [url=https://climate.nasa.gov/news/2919/earths-atmosphere-a-multi-layered-cake/]Earth's atmosphere[/url]. The unusual color is known as a [url=https://en.wikipedia.org/wiki/Green_flash]green flash[/url] and occurs because these atmospheric layers not only shift background images but disperse colors into slightly different directions, like a [url=https://phet.colorado.edu/sims/html/bending-light/latest/bending-light_en.html]prism[/url]. The featured video was captured earlier this month off the coast of [url=https://youtu.be/dB-qilyUX2Q]Hawai[/url][url=https://en.wikipedia.org/wiki/Hawaii]i[/url], [url=https://www.cia.gov/the-world-factbook/countries/united-states/]USA[/url]. After [url=https://i.cbc.ca/1.6583971.1663276172!/fileImage/httpImage/cat-boredom.jpg]waiting[/url] those 60 seconds, at the video's end, the upper part of [url=https://apod.nasa.gov/apod/ap230222.html]the Sun[/url] seems to hover alone in space, while turning not only [url=https://apod.nasa.gov/apod/ap230328.html]green[/url], but [url=https://apod.nasa.gov/apod/ap110104.html]blue[/url]. Then suddenly, the Sun appears to shrink to nothing -- only to return tomorrow.
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