﻿ 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 __________________________________________________________________ [28]< | [29]Archive | [30]Submissions | [31]Index | [32]Search | [33]Calendar | [34]RSS | [35]Education | [36]About APOD | [37]Discuss | [38]> __________________________________________________________________ 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/