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 August 5
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                              Tycho and Clavius
         Image Credit & [3]Copyright: [4]Eduardo Schaberger Poupeau

   Explanation: [5]South is up in this detailed telescopic view across the
   Moon's rugged southern highlands. Captured on July 20, the lunar
   landscape features the Moon's young and old, the large craters Tycho
   and Clavius. About 100 million years young, [6]Tycho is the
   sharp-walled 85 kilometer diameter crater near center, its 2 kilometer
   tall central peak in bright sunlight and [7]dark shadow. Debris ejected
   during the impact that created Tycho still make it the [8]stand out
   lunar crater when the [9]Moon is near full, producing a highly visible
   radiating system of light streaks, bright rays that extend across much
   of the lunar near side. In fact, some of the material collected at the
   Apollo 17 landing site, about 2,000 kilometers away, likely originated
   [10]from the Tycho impact. One of the oldest and largest craters on the
   Moon's near side, 225 kilometer diameter [11]Clavius is due south
   (above) of Tycho. [12]Clavius crater's own ray system resulting from
   its original impact event would have faded long ago. The old crater's
   worn walls and smooth floor are now overlayed by smaller craters from
   impacts that occurred after Clavius was formed. Observations by the
   Stratospheric Observatory for Infrared Astronomy (SOFIA) published in
   2020 found [13]water at Clavius. Of course both young Tycho and old
   Clavius craters are lunar locations in the science fiction epic
   [14]2001: A Space Odyssey.

                     Tomorrow's picture: stars and dust
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    Authors & editors: [26]Robert Nemiroff ([27]MTU) & [28]Jerry Bonnell
                                 ([29]UMCP)
          NASA Official: Phillip Newman [30]Specific rights apply.
              [31]NASA Web Privacy Policy and Important Notices
                A service of: [32]ASD at [33]NASA / [34]GSFC
                           & [35]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2108/Luna-Tycho-Clavius-high.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. https://www.facebook.com/astrofotografiarafaela/
   5. https://apod.nasa.gov/apod/ap200206.html
   6. http://lroc.sese.asu.edu/exhibits/A New Moon Rises/38
   7. https://apod.nasa.gov/apod/ap110706.html
   8. https://skyandtelescope.org/observing/full-moon-is-tycho-time/
   9. https://apod.nasa.gov/apod/ap120901.html
  10. https://www.nasa.gov/mission_pages/LRO/multimedia/lroimages/lroc-20100114-tycho.html
  11. https://www.flickr.com/photos/136797589@N04/26945796059/
  12. https://en.wikipedia.org/wiki/Clavius_(crater)
  13. https://www.nasa.gov/press-release/nasa-s-sofia-discovers-water-on-sunlit-surface-of-moon
  14. https://en.wikipedia.org/wiki/2001:_A_Space_Odyssey_(film)
  15. https://apod.nasa.gov/apod/ap210804.html
  16. https://apod.nasa.gov/apod/archivepix.html
  17. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  18. https://apod.nasa.gov/apod/lib/aptree.html
  19. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  20. https://apod.nasa.gov/apod/calendar/allyears.html
  21. https://apod.nasa.gov/apod.rss
  22. https://apod.nasa.gov/apod/lib/edlinks.html
  23. https://apod.nasa.gov/apod/lib/about_apod.html
  24. http://asterisk.apod.com/discuss_apod.php?date=210805
  25. https://apod.nasa.gov/apod/ap210806.html
  26. http://www.phy.mtu.edu/faculty/Nemiroff.html
  27. http://www.phy.mtu.edu/
  28. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  29. http://www.astro.umd.edu/
  30. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  31. https://www.nasa.gov/about/highlights/HP_Privacy.html
  32. https://astrophysics.gsfc.nasa.gov/
  33. https://www.nasa.gov/
  34. https://www.nasa.gov/centers/goddard/
  35. http://www.mtu.edu/