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.

                                2025 April 20
   [2]A complex nebula fills the frame that is brightly colored, with red
      being prominent in the image center and blue being most prominent
     elsewhere. Stars also dot the image. Please see the explanation for
                         more detailed information.

                  The Orion Nebula in Visible and Infrared
        Image Credit & Copyright: Infrared: [3]NASA, [4]Spitzer Space
        Telescope; Visible: [5]Oliver Czernetz, [6]Siding Spring Obs.

   Explanation: The Great Nebula in Orion is a colorful place. Visible to
   the unaided eye, it appears as a small [7]fuzzy patch in the
   [8]constellation of Orion. Long exposure, [9]multi-wavelength images
   like this, however, show the [10]Orion Nebula to be a busy neighborhood
   of young stars, hot gas, and dark [11]dust. This [12]digital composite
   features not only three colors of [13]visible light but four colors of
   [14]infrared light taken by [15]NASA's orbiting [16]Spitzer Space
   Telescope as well. The power behind much of the [17]Orion Nebula (M42)
   is the [18]Trapezium - four of the brightest stars in the nebula. Many
   of the [19]filamentary structures visible are actually [20]shock waves
   - fronts where fast moving material encounters slow moving gas. The
   Orion Nebula spans about 40 light years and is [21]located about 1500
   [22]light years away in the same [23]spiral arm of [24]our Galaxy as
   the [25]Sun.

                 Tomorrow's picture: galaxy-sized telescope
     __________________________________________________________________

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    Authors & editors: [37]Robert Nemiroff ([38]MTU) & [39]Jerry Bonnell
                                 ([40]UMCP)
          NASA Official: Amber Straughn [41]Specific rights apply.
            [42]NASA Web Privacy, [43]Accessibility, [44]Notices;
                A service of: [45]ASD at [46]NASA / [47]GSFC,
                         [48]NASA Science Activation
                           & [49]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2504/M42_SpitzerCzernetz_2000.jpg
   3. http://www.nasa.gov/
   4. http://www.spitzer.caltech.edu/mission
   5. http://www.astrobin.com/users/OliverCzernetz/
   6. http://rsaa.anu.edu.au/observatories/siding-spring-observatory
   7. https://apod.nasa.gov/apod/ap030207.html
   8. https://en.wikipedia.org/wiki/Orion_(constellation)
   9. https://apod.nasa.gov/apod/ap140115.html
  10. http://apod.nasa.gov/cgi-bin/apod/apod_search?tquery=M42
  11. https://apod.nasa.gov/apod/ap030706.html
  12. http://www.astrobin.com/247510/
  13. https://science.nasa.gov/ems/09_visiblelight/
  14. https://science.nasa.gov/ems/07_infraredwaves/
  15. http://www.nasa.gov/
  16. https://science.nasa.gov/mission/spitzer/
  17. https://en.wikipedia.org/wiki/Orion_Nebula
  18. https://apod.nasa.gov/apod/ap240105.html
  19. https://apod.nasa.gov/apod/ap190102.html
  20. https://apod.nasa.gov/apod/ap240104.html
  21. https://apod.nasa.gov/apod/ap020530.html
  22. https://spaceplace.nasa.gov/light-year/en/
  23. https://science.nasa.gov/resource/the-milky-way-galaxy/
  24. http://www.atlasoftheuniverse.com/galaxy.html
  25. https://science.nasa.gov/sun/
  26. https://apod.nasa.gov/apod/ap250419.html
  27. https://apod.nasa.gov/apod/archivepix.html
  28. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  29. https://apod.nasa.gov/apod/lib/aptree.html
  30. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  31. https://apod.nasa.gov/apod/calendar/allyears.html
  32. https://apod.com/feed.rss
  33. https://apod.nasa.gov/apod/lib/edlinks.html
  34. https://apod.nasa.gov/apod/lib/about_apod.html
  35. https://asterisk.apod.com/discuss_apod.php?date=250420
  36. https://apod.nasa.gov/apod/ap250421.html
  37. http://www.phy.mtu.edu/faculty/Nemiroff.html
  38. http://www.phy.mtu.edu/
  39. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  40. http://www.astro.umd.edu/
  41. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  42. https://www.nasa.gov/about/highlights/HP_Privacy.html
  43. https://www.nasa.gov/general/accessibility/
  44. https://www.nasa.gov/privacy/
  45. https://astrophysics.gsfc.nasa.gov/
  46. https://www.nasa.gov/
  47. https://www.nasa.gov/centers/goddard/
  48. https://science.nasa.gov/learners
  49. http://www.mtu.edu/