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 October 3
    [2]The picture shows a seemingly random series of color patches that
    when stared in with binocular vision, reveals a teapot in the center.
          Please see the explanation for more detailed information.

                   The Holographic Principle and a Teapot
                          Image Credit: [3]Caltech

   Explanation: Sure, you can see the 2D rectangle of colors, but can you
   see deeper? Counting color patches in the [4]featured image, you might
   estimate that the most information that this 2D digital image can hold
   is about 60 (horizontal) x 50(vertical) x 256 (possible colors) =
   768,000 bits. However, the yet-unproven [5]Holographic Principle states
   that, [6]counter-intuitively, the information in a 2D panel can include
   all of the information in a 3D room that can be enclosed by the panel.
   [7]The principle derives from the idea that the [8]Planck length, the
   length scale where [9]quantum mechanics begins to dominate
   [10]classical gravity, is one side of an area that can hold only
   [11]about one bit of information. The limit was [12]first postulated by
   physicist [13]Gerard 't Hooft in 1993. It can arise from
   generalizations from seemingly [14]distant speculation that the
   information held by a [15]black hole is determined not by its enclosed
   volume but by the surface area of its [16]event horizon. The term
   "[17]holographic" arises from a [18]hologram analogy where
   three-dimension images are created by projecting light through a flat
   screen. Beware, some people [19]staring at the [20]featured image may
   not think it encodes just 768,000 bits -- nor even 256^3,000 bit
   [21]permutations -- rather they might claim it [22]encodes a
   three-dimensional [23]teapot.

                      Tomorrow's picture: galaxy tails
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    Authors & editors: [35]Robert Nemiroff ([36]MTU) & [37]Jerry Bonnell
                                 ([38]UMCP)
          NASA Official: Phillip Newman [39]Specific rights apply.
              [40]NASA Web Privacy Policy and Important Notices
                A service of: [41]ASD at [42]NASA / [43]GSFC
                           & [44]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2110/teapotsirds_winfree_960.jpg
   3. http://www.cs.caltech.edu/
   4. https://www.dna.caltech.edu/~winfree/old_html/Images/shrunkpot2.gif
   5. https://en.wikipedia.org/wiki/Holographic_principle
   6. https://ui.adsabs.harvard.edu/abs/1997PhRvD..55.5112B/abstract
   7. https://youtu.be/klpDHn8viX8
   8. https://www.physlink.com/Education/AskExperts/ae281.cfm
   9. https://en.wikipedia.org/wiki/Quantum_mechanics
  10. https://mathshistory.st-andrews.ac.uk/HistTopics/General_relativity/
  11. https://apod.nasa.gov/apod/ap170401.html
  12. https://www.arxiv.org/abs/gr-qc/9310026
  13. https://webspace.science.uu.nl/~hooft101/
  14. https://www.arxiv.org/abs/hep-th/0203101
  15. https://science.nasa.gov/astrophysics/focus-areas/black-holes
  16. https://solarsystem.nasa.gov/news/1068/10-questions-you-might-have-about-black-holes/
  17. http://backreaction.blogspot.com/2021/03/is-universe-really-hologram.html
  18. https://en.wikipedia.org/wiki/Holography
  19. https://www.cats.org.uk/media/5369/cat-staring.jpg
  20. https://www.dna.caltech.edu/~winfree/old_html/Images/shrunkpot2.gif
  21. https://chortle.ccsu.edu/assemblytutorial/Chapter-03/ass03_6.html
  22. https://en.wikipedia.org/wiki/Autostereogram
  23. https://en.wikipedia.org/wiki/Teapot#/media/File:Black_tea_pot_cropped.jpg
  24. https://apod.nasa.gov/apod/ap211002.html
  25. https://apod.nasa.gov/apod/archivepix.html
  26. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  27. https://apod.nasa.gov/apod/lib/aptree.html
  28. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  29. https://apod.nasa.gov/apod/calendar/allyears.html
  30. https://apod.nasa.gov/apod.rss
  31. https://apod.nasa.gov/apod/lib/edlinks.html
  32. https://apod.nasa.gov/apod/lib/about_apod.html
  33. http://asterisk.apod.com/discuss_apod.php?date=211003
  34. https://apod.nasa.gov/apod/ap211004.html
  35. http://www.phy.mtu.edu/faculty/Nemiroff.html
  36. http://www.phy.mtu.edu/
  37. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  38. http://www.astro.umd.edu/
  39. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  40. https://www.nasa.gov/about/highlights/HP_Privacy.html
  41. https://astrophysics.gsfc.nasa.gov/
  42. https://www.nasa.gov/
  43. https://www.nasa.gov/centers/goddard/
  44. http://www.mtu.edu/