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.

                              2021 November 19
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                        NGC 281: Starless with Stars
     Image Credit & [3]Copyright: [4]Wido Oerlemans - X-ray: [5]Chandra,
                            Infrared: [6]Spitzer

   Explanation: In visible light the stars have been removed from this
   narrow-band image [7]of NGC 281, a star forming region some 10,000
   light-years away toward the constellation Cassiopeia. Stars were
   digitally added back to the resulting [8]starless image though. But
   instead of using visible light image data, the stars were added with
   [9]X-ray data (in purple) from the Chandra X-ray Observatory and
   [10]infrared data (in red) from the Spitzer Space Telescope. The merged
   [11]multiwavelength view reveals a multitude of stars in the region's
   embedded star cluster [12]IC 1590. The young stars are normally hidden
   in visible light images by the natal cloud's gas and obscuring dust.
   Also known to backyard astro-imagers as the [13]Pacman Nebula for its
   overall appearance in visible light, NGC 281 is about 80 light-years
   across.

                      Tomorrow's picture: light-weekend
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    Authors & editors: [25]Robert Nemiroff ([26]MTU) & [27]Jerry Bonnell
                                 ([28]UMCP)
          NASA Official: Phillip Newman [29]Specific rights apply.
              [30]NASA Web Privacy Policy and Important Notices
                A service of: [31]ASD at [32]NASA / [33]GSFC
                           & [34]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2111/starless_color.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. mailto:%20firstnamelastname%20[at]%20hotmail%20[dot]
   5. https://chandra.harvard.edu/
   6. https://www.spitzer.caltech.edu/
   7. https://apod.nasa.gov/apod/ap110825.html
   8. https://apod.nasa.gov/apod/ap210827.html
   9. https://chandra.harvard.edu/photo/2011/ngc281/
  10. https://www.spitzer.caltech.edu/image/sig11-014-living-the-high-life
  11. https://science.nasa.gov/ems/01_intro
  12. https://arxiv.org/abs/2106.15129
  13. https://www.google.com/doodles/30th-anniversary-of-pac-man
  14. https://apod.nasa.gov/apod/ap211118.html
  15. https://apod.nasa.gov/apod/archivepix.html
  16. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  17. https://apod.nasa.gov/apod/lib/aptree.html
  18. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  19. https://apod.nasa.gov/apod/calendar/allyears.html
  20. https://apod.nasa.gov/apod.rss
  21. https://apod.nasa.gov/apod/lib/edlinks.html
  22. https://apod.nasa.gov/apod/lib/about_apod.html
  23. http://asterisk.apod.com/discuss_apod.php?date=211119
  24. https://apod.nasa.gov/apod/ap211120.html
  25. http://www.phy.mtu.edu/faculty/Nemiroff.html
  26. http://www.phy.mtu.edu/
  27. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  28. http://www.astro.umd.edu/
  29. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  30. https://www.nasa.gov/about/highlights/HP_Privacy.html
  31. https://astrophysics.gsfc.nasa.gov/
  32. https://www.nasa.gov/
  33. https://www.nasa.gov/centers/goddard/
  34. http://www.mtu.edu/