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 September 6

                                   IFRAME:
   [2]https://www.youtube.com/embed/QmCFdFGNwmo?si=Sp8Y5IS2-pWVLPn0?rel=0

                 HESS Telescopes Explore the High-Energy Sky
    Credit & Copyright: Video Credit & Copyright: [3]Jeff Dai ([4]TWAN),
                         [5]H.E.S.S. Collaboration;
       Music: [6]Ibaotu catalog number 1044988 (Used with permission)

   Explanation: They may look like modern mechanical dinosaurs, but they
   are enormous swiveling eyes that watch the sky. The [7]High Energy
   Stereoscopic System (H.E.S.S.) Observatory is composed of four 12-meter
   reflecting-mirror telescopes surrounding a [8]larger telescope housing
   a 28-meter mirror. They are designed to detect strange flickers of blue
   light -- [9]Cherenkov radiation --emitted when [10]charged particles
   move slightly faster than the [11]speed of light in air. This light is
   emitted when a [12]gamma ray from a distant source strikes a molecule
   in [13]Earth's atmosphere and starts a [14]charged-particle shower.
   [15]H.E.S.S. is sensitive to some of the highest energy photons
   ([16]TeV) crossing the universe. Operating since 2003 in [17]Namibia,
   H.E.S.S. has searched for [18]dark matter and has [19]discovered over
   50 sources emitting high energy radiation including [20]supernova
   remnants and the [21]centers of galaxies that contain supermassive
   [22]black holes. Pictured in June, [23]H.E.S.S. telescopes swivel and
   stare in [24]time-lapse sequences shot in front of our [25]Milky Way
   Galaxy and the [26]Magellanic Clouds -- as the occasional
   Earth-orbiting satellite zips by.

                Surf the Universe: [27]Random APOD Generator
                    Tomorrow's picture: large star cloud
     __________________________________________________________________

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     __________________________________________________________________

    Authors & editors: [39]Robert Nemiroff ([40]MTU) & [41]Jerry Bonnell
                                 ([42]UMCP)
          NASA Official: Phillip Newman [43]Specific rights apply.
              [44]NASA Web Privacy Policy and Important 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://www.youtube.com/embed/QmCFdFGNwmo?si=Sp8Y5IS2-pWVLPn0?rel=0
   3. https://www.twanight.org/Dai
   4. https://www.twanight.org/
   5. https://www.mpi-hd.mpg.de/hfm/HESS/pages/collaboration/
   6. https://ibaotu.com/sucai/1044988.html
   7. https://www.mpi-hd.mpg.de/hfm/HESS/pages/about/telescopes/
   8. https://apod.nasa.gov/apod/ap120727.html
   9. https://en.wikipedia.org/wiki/Cherenkov_radiation
  10. https://en.wikipedia.org/wiki/Charged_particle
  11. https://en.wikipedia.org/wiki/Speed_of_light
  12. https://science.nasa.gov/ems/12_gammarays
  13. https://spaceplace.nasa.gov/atmosphere/
  14. https://apod.nasa.gov/apod/ap060814.html
  15. https://www.mpi-hd.mpg.de/hfm/HESS/pages/about/
  16. https://scienceblogs.com/builtonfacts/2013/11/27/how-often-does-the-sun-emit-1-tev-photons
  17. https://en.wikipedia.org/wiki/Namibia
  18. https://www.nasa.gov/audience/forstudents/9-12/features/what-is-dark-matter.html
  19. https://ui.adsabs.harvard.edu/abs/2018A&A...612A...1H/abstract
  20. https://apod.nasa.gov/apod/ap230601.html
  21. https://apod.nasa.gov/apod/ap180729.html
  22. https://apod.nasa.gov/htmltest/rjn_bht.html
  23. https://youtu.be/0u9lr1RXpsE
  24. https://youtu.be/xjMtlL1dCeA
  25. https://apod.nasa.gov/apod/ap180427.html
  26. https://apod.nasa.gov/apod/ap160725.html
  27. https://apod.nasa.gov/apod/random_apod.html
  28. https://apod.nasa.gov/apod/ap230905.html
  29. https://apod.nasa.gov/apod/archivepix.html
  30. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  31. https://apod.nasa.gov/apod/lib/aptree.html
  32. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  33. https://apod.nasa.gov/apod/calendar/allyears.html
  34. https://apod.nasa.gov/apod.rss
  35. https://apod.nasa.gov/apod/lib/edlinks.html
  36. https://apod.nasa.gov/apod/lib/about_apod.html
  37. https://asterisk.apod.com/discuss_apod.php?date=230906
  38. https://apod.nasa.gov/apod/ap230907.html
  39. http://www.phy.mtu.edu/faculty/Nemiroff.html
  40. http://www.phy.mtu.edu/
  41. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  42. http://www.astro.umd.edu/
  43. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  44. https://www.nasa.gov/about/highlights/HP_Privacy.html
  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/