﻿ Astronomy Picture of the Day [1]Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2023 October 25 IFRAME: [2]https://www.youtube.com/embed/J3_88eyN44w?rel=0 Gone in 60 Seconds: A Green Flash Sunset Video Credit & Copyright: [3]Tengyu Cai Explanation: In 60 seconds, this setting Sun will turn green. Actually, the top of [4]the Sun already appears not only green, but wavey -- along with all of its edges. The Sun itself is unchanged -- both [5]effects are caused by looking along hot and cold layers in [6]Earth's atmosphere. The unusual color is known as a [7]green flash and occurs because these atmospheric layers not only shift background images but disperse colors into slightly different directions, like a [8]prism. The featured video was captured earlier this month off the coast of [9]Hawai[10]i, [11]USA. After [12]waiting those 60 seconds, at the video's end, the upper part of [13]the Sun seems to hover alone in space, while turning not only [14]green, but [15]blue. Then suddenly, the Sun appears to shrink to nothing -- only to return tomorrow. Tomorrow's picture: open space __________________________________________________________________ [16]< | [17]Archive | [18]Submissions | [19]Index | [20]Search | [21]Calendar | [22]RSS | [23]Education | [24]About APOD | [25]Discuss | [26]> __________________________________________________________________ Authors & editors: [27]Robert Nemiroff ([28]MTU) & [29]Jerry Bonnell ([30]UMCP) NASA Official: Phillip Newman [31]Specific rights apply. [32]NASA Web Privacy Policy and Important Notices A service of: [33]ASD at [34]NASA / [35]GSFC, [36]NASA Science Activation & [37]Michigan Tech. U. References 1. https://apod.nasa.gov/apod/archivepix.html 2. https://www.youtube.com/embed/J3_88eyN44w?rel=0 3. https://www.instagram.com/tengyu.cai/ 4. https://science.nasa.gov/sun/ 5. https://apod.nasa.gov/apod/ap090223.html 6. https://climate.nasa.gov/news/2919/earths-atmosphere-a-multi-layered-cake/ 7. https://en.wikipedia.org/wiki/Green_flash 8. https://phet.colorado.edu/sims/html/bending-light/latest/bending-light_en.html 9. https://youtu.be/dB-qilyUX2Q 10. https://en.wikipedia.org/wiki/Hawaii 11. https://www.cia.gov/the-world-factbook/countries/united-states/ 12. https://i.cbc.ca/1.6583971.1663276172!/fileImage/httpImage/cat-boredom.jpg 13. https://apod.nasa.gov/apod/ap230222.html 14. https://apod.nasa.gov/apod/ap230328.html 15. https://apod.nasa.gov/apod/ap110104.html 16. https://apod.nasa.gov/apod/ap231024.html 17. https://apod.nasa.gov/apod/archivepix.html 18. https://apod.nasa.gov/apod/lib/apsubmit2015.html 19. https://apod.nasa.gov/apod/lib/aptree.html 20. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search 21. https://apod.nasa.gov/apod/calendar/allyears.html 22. https://apod.com/feed.rss 23. https://apod.nasa.gov/apod/lib/edlinks.html 24. https://apod.nasa.gov/apod/lib/about_apod.html 25. https://asterisk.apod.com/discuss_apod.php?date=231025 26. https://apod.nasa.gov/apod/ap231026.html 27. http://www.phy.mtu.edu/faculty/Nemiroff.html 28. http://www.phy.mtu.edu/ 29. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html 30. http://www.astro.umd.edu/ 31. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 32. https://www.nasa.gov/about/highlights/HP_Privacy.html 33. https://astrophysics.gsfc.nasa.gov/ 34. https://www.nasa.gov/ 35. https://www.nasa.gov/centers/goddard/ 36. https://science.nasa.gov/learners 37. http://www.mtu.edu/