Astronomy Picture of the Day
Astronomy Picture of the Day
Discover the cosmos! [1] Each day a different image or photograph of our
fascinating universe is featured, along with a brief explanation written by a
professional astronomer.
2018 September 26
[2]
The Sun's Spectrum with its Missing Colors
Image Credit: Nigel Sharp (NSF [3] ), FTS [4] , NSO [5] , KPNO [6] , AURA [7]
, NSF [8]
Explanation: It is still not known why the Sun's light is missing some colors.
Here are all the visible [9] colors of the Sun [10] , produced by passing the
Sun's light through a prism [11] -like device. The spectrum [12] was created
at the McMath-Pierce [13] Solar Observatory [14] and shows, first off, that
although our white [15] -appearing Sun [16] emits light of nearly every color
[17] , it does indeed appear brightest in yellow-green light. The dark patches
in the above spectrum [18] arise from gas at or above the Sun's surface [19]
absorbing sunlight emitted below. Since different types of gas absorb
different colors of light [20] , it is possible to determine what gasses
compose the Sun. Helium [21] , for example, was first discovered [22] in 1870
on a solar spectrum and only later found [23] here on Earth [24] . Today, the
majority of spectral absorption lines [25] have been identified - but not all
[26] .
Tomorrow's picture: open space
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Authors & editors: Robert Nemiroff [38] (MTU [39] ) & Jerry Bonnell [40]
(UMCP [41] )
NASA Official: Phillip Newman Specific rights apply [42] .
NASA Web Privacy Policy and Important Notices [43]
A service of: ASD [44] at NASA [45] / GSFC [46]
& Michigan Tech. U. [47]
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Site notes:
[1] archivepix.html
[2] image/1809/sunspectrum_noao_3071.jpg
[3] https://www.nsf.gov/
[4] https://www.noao.edu/noao/staff/plymate/fts/a...
[5] https://www.nso.edu/
[6] https://www.noao.edu/kpno/
[7] https://www.aura-astronomy.org/
[8] https://www.nsf.gov/
[9] https://science.nasa.gov/ems/09_visiblelight
[10] https://solarsystem.nasa.gov/solar-system/sun...
[11] http://en.wikipedia.org/wiki/Prism_%28optics%...
[12] http://www.noao.edu/image_gallery/html/im0600...
[13] http://www.noao.edu/kpno/40th/mcpierce.html
[14] ap120316.html
[15] http://solar-center.stanford.edu/SID/activiti...
[16] sun.html
[17]
https://www.windows2universe.org/sun/spectrum...
[18] http://www.noao.edu/image_gallery/html/im0600...
[19] ap160919.html
[20] http://astronomy.swin.edu.au/cosmos/a/absorpt...
[21] http://en.wikipedia.org/wiki/Helium
[22]
https://www.smithsonianmag.com/history/
how-scientists-discovered-helium-first-alien-element-1868-180970057/
[23] http://www.youtube.com/watch?v=d-XbjFn3aqE
[24] http://antwrp.gsfc.nasa.gov/apod/image/0208/e...
[25]
https://www.khanacademy.org/partner-content/n...
spectroscopy/a/absorptionemission-lines
[26] http://adsabs.harvard.edu/abs/2005ASPC..336.....
[27] ap180925.html
[28] archivepix.html
[29] lib/apsubmit2015.html
[30] lib/aptree.html
[31] https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apo...
[32] calendar/allyears.html
[33] /apod.rss
[34] lib/edlinks.html
[35] lib/about_apod.html
[36] http://asterisk.apod.com/discuss_apod.php?dat...
[37] ap180927.html
[38] http://www.phy.mtu.edu/faculty/Nemiroff.html
[39] http://www.phy.mtu.edu/
[40] https://antwrp.gsfc.nasa.gov/htmltest/jbonnel...
[41] http://www.astro.umd.edu/
[42] lib/about_apod.html#srapply
[43] https://www.nasa.gov/about/highlights/HP_Priv...
[44] https://astrophysics.gsfc.nasa.gov/
[45] https://www.nasa.gov/
[46] https://www.nasa.gov/centers/goddard/
[47] http://www.mtu.edu/
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