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 June 11
    [2]A rainbow of the Sun's colors is shown from deep red on the upper
    left to deep blue on the lower right. Some horizontal lines have gaps
    that appear dark where some colors are missing. the image. Please see
               the explanation for more detailed information.

                       The Sun and Its Missing Colors
    Image Credit: Nigel Sharp ([3]NSF), [4]FTS, [5]NSO, [6]KPNO, [7]AURA,
                                   [8]NSF

   Explanation: Here are all the [9]visible colors of the [10]Sun,
   produced by passing the Sun's light through a [11]prism-like device.
   [12]The spectrum was created at the [13]McMath-Pierce [14]Solar
   Observatory and shows, first off, that although our [15]white-appearing
   [16]Sun emits light of nearly [17]every color, it appears brightest in
   yellow-green light. The dark patches in the [18]featured spectrum arise
   from gas at or above the [19]Sun's surface absorbing sunlight emitted
   below. Since different types of gas [20]absorb different colors of
   light, it is possible to determine what gasses compose the Sun.
   [21]Helium, for example, was [22]first discovered in 1870 on a solar
   spectrum and only [23]later found here on [24]Earth. Today, the
   majority of [25]spectral absorption lines have been identified - but
   [26]not all.

                   Tomorrow's picture: largest satellites
     __________________________________________________________________

      [27]< | [28]Archive | [29]Submissions | [30]Index | [31]Search |
   [32]Calendar | [33]RSS | [34]Education | [35]About APOD | [36]Discuss |
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     __________________________________________________________________

    Authors & editors: [38]Robert Nemiroff ([39]MTU) & [40]Jerry Bonnell
                                 ([41]UMCP)
          NASA Official: Phillip Newman [42]Specific rights apply.
              [43]NASA Web Privacy Policy and Important Notices
                A service of: [44]ASD at [45]NASA / [46]GSFC,
                         [47]NASA Science Activation
                           & [48]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2306/sunspectrum_mpso_3071.jpg
   3. https://www.nsf.gov/
   4. https://noirlab.edu/public/images/noao-02592/
   5. https://www.nso.edu/
   6. https://noirlab.edu/public/programs/kitt-peak-national-observatory/
   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/overview/
  11. http://en.wikipedia.org/wiki/Prism_(optics)
  12. https://noirlab.edu/public/images/noao-sun/
  13. https://noirlab.edu/public/programs/kitt-peak-national-observatory/mcmath-pierce-solar-telescope/
  14. https://apod.nasa.gov/apod/ap120316.html
  15. http://solar-center.stanford.edu/SID/activities/GreenSun.html
  16. https://apod.nasa.gov/apod/sun.html
  17. https://www.windows2universe.org/sun/spectrum/multispectral_sun_overview.html
  18. https://noirlab.edu/public/images/noao-sun/
  19. https://apod.nasa.gov/apod/ap160919.html
  20. http://astronomy.swin.edu.au/cosmos/a/absorption+line
  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/earthlights02_dmsp_big.jpg
  25. https://www.khanacademy.org/partner-content/nasa/measuringuniverse/spectroscopy/a/absorptionemission-lines
  26. https://ui.adsabs.harvard.edu/abs/2005ASPC..336...25A/abstract
  27. https://apod.nasa.gov/apod/ap230610.html
  28. https://apod.nasa.gov/apod/archivepix.html
  29. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  30. https://apod.nasa.gov/apod/lib/aptree.html
  31. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  32. https://apod.nasa.gov/apod/calendar/allyears.html
  33. https://apod.nasa.gov/apod.rss
  34. https://apod.nasa.gov/apod/lib/edlinks.html
  35. https://apod.nasa.gov/apod/lib/about_apod.html
  36. https://asterisk.apod.com/discuss_apod.php?date=230611
  37. https://apod.nasa.gov/apod/ap230612.html
  38. http://www.phy.mtu.edu/faculty/Nemiroff.html
  39. http://www.phy.mtu.edu/
  40. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  41. http://www.astro.umd.edu/
  42. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  43. https://www.nasa.gov/about/highlights/HP_Privacy.html
  44. https://astrophysics.gsfc.nasa.gov/
  45. https://www.nasa.gov/
  46. https://www.nasa.gov/centers/goddard/
  47. https://science.nasa.gov/learners
  48. http://www.mtu.edu/