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.

                                2024 April 28
    [2]In the center is a colorful nebula, the most usually seen part of
      the Ring Nebula. Several layers of red-glowing gas with different
   structures are seen surrounding this center. Please see the explanation
                       for more detailed information.

                        Rings Around the Ring Nebula
      Image Credit: [3]Hubble, [4]Large Binocular Telescope, [5]Subaru
            Telescope; Composition & Copyright: [6]Robert Gendler

   Explanation: The [7]Ring Nebula (M57) is more complicated than it
   appears through a small telescope. The easily visible [8]central ring
   is about one [9]light-year across, but [10]this remarkably deep
   exposure - a [11]collaborative effort combining data from three
   different large telescopes - [12]explores the looping filaments of
   glowing gas extending much farther from [13]the nebula's central star.
   This [14]composite image includes red light emitted by hydrogen as well
   as visible and [15]infrared light. The Ring Nebula is an elongated
   [16]planetary nebula, a type of nebula created when a [17]Sun-like star
   evolves to [18]throw off its outer atmosphere and become a [19]white
   dwarf star. The [20]Ring Nebula is about 2,500 light-years away toward
   the musical [21]constellation Lyra.

   Your Sky Surprise: [22]What picture did APOD feature on your birthday?
                                 (post 1995)
                   Tomorrow's picture: comet, planet, moon
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    Authors & editors: [34]Robert Nemiroff ([35]MTU) & [36]Jerry Bonnell
                                 ([37]UMCP)
          NASA Official: Amber Straughn [38]Specific rights apply.
            [39]NASA Web Privacy, [40]Accessibility, [41]Notices;
                A service of: [42]ASD at [43]NASA / [44]GSFC,
                         [45]NASA Science Activation
                           & [46]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2404/M57Ring_HubbleGendler_3000.jpg
   3. https://hla.stsci.edu/
   4. https://www.lbto.org/
   5. https://subarutelescope.org/en/
   6. http://www.robgendlerastropics.com/Biography2.html
   7. https://en.wikipedia.org/wiki/Ring_nebula
   8. https://apod.nasa.gov/apod/ap230402.html
   9. http://chandra.harvard.edu/photo/cosmic_distance.html
  10. http://www.robgendlerastropics.com/M57-HST-LBT.html
  11. https://i.ytimg.com/vi/t8tjT9MA7yU/hqdefault.jpg
  12. https://ui.adsabs.harvard.edu/abs/2004A&A...417..637C/abstract
  13. https://apod.nasa.gov/apod/ap210721.html
  14. http://www.robgendlerastropics.com/M57-HST-LBT.html
  15. https://science.nasa.gov/ems/07_infraredwaves
  16. https://astronomy.swin.edu.au/cosmos/p/Planetary+Nebulae
  17. https://apod.nasa.gov/apod/ap230611.html
  18. https://www.youtube.com/watch?v=6FSIfUYFeTM
  19. https://imagine.gsfc.nasa.gov/science/objects/dwarfs2.html
  20. https://www.youtube.com/watch?v=OiYRL3HFULU
  21. http://www.hawastsoc.org/deepsky/lyr/index.html
  22. https://apod.nasa.gov/apod/calendar/allyears.html
  23. https://apod.nasa.gov/apod/ap240427.html
  24. https://apod.nasa.gov/apod/archivepix.html
  25. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  26. https://apod.nasa.gov/apod/lib/aptree.html
  27. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  28. https://apod.nasa.gov/apod/calendar/allyears.html
  29. https://apod.com/feed.rss
  30. https://apod.nasa.gov/apod/lib/edlinks.html
  31. https://apod.nasa.gov/apod/lib/about_apod.html
  32. https://asterisk.apod.com/discuss_apod.php?date=240428
  33. https://apod.nasa.gov/apod/ap240429.html
  34. http://www.phy.mtu.edu/faculty/Nemiroff.html
  35. http://www.phy.mtu.edu/
  36. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  37. http://www.astro.umd.edu/
  38. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  39. https://www.nasa.gov/about/highlights/HP_Privacy.html
  40. https://www.nasa.gov/general/accessibility/
  41. https://www.nasa.gov/privacy/
  42. https://astrophysics.gsfc.nasa.gov/
  43. https://www.nasa.gov/
  44. https://www.nasa.gov/centers/goddard/
  45. https://science.nasa.gov/learners
  46. http://www.mtu.edu/