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.

                                2022 July 16
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

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

   Explanation: South is up in this dramatic telescopic view of the
   [5]lunar terminator and the Moon's rugged southern highlands. The lunar
   landscape was captured on July 7 with the moon at its [6]first quarter
   phase. The Sun shines at a low angle from the right as dawn comes to
   the region's young and old craters [7]Tycho and Clavius. About 100
   million years young, [8]Tycho is the sharp-walled 85 kilometer diameter
   crater below and left of center. Its 2 kilometer tall central peak and
   far crater wall reflect bright sunlight, Its smooth floor lies in dark
   shadow. Debris ejected during the impact that created Tycho make it the
   [9]stand out lunar crater when the [10]Moon is near full though. They
   produce a highly visible radiating system of light streaks or 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 [11]from the Tycho impact. One of
   the oldest and largest craters on the Moon's near side, 225 kilometer
   diameter [12]Clavius is due south (above) of Tycho. [13]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 newer smaller craters from impacts that occurred after
   Clavius was formed. Reaching above the older crater, tops of the newer
   crater walls reflect this dawn's early light to create narrow shining
   arcs within a shadowed Clavius.

                   Tomorrow's picture: Europa and Jupiter
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    Authors & editors: [25]Robert Nemiroff ([26]MTU) & [27]Jerry Bonnell
                                 ([28]UMCP)
          NASA Official: Phillip Newman [29]Specific rights apply.
              [30]NASA Web Privacy Policy and Important Notices
                A service of: [31]ASD at [32]NASA / [33]GSFC
                           & [34]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2207/Dawn-in-Clavius-Tycho-07-07-22.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. https://www.facebook.com/astrofotografiarafaela/
   5. https://earthsky.org/astronomy-essentials/definition-moon-planet-terminator-line-twilight-zone/
   6. https://svs.gsfc.nasa.gov/4955
   7. https://apod.nasa.gov/apod/ap210805.html
   8. http://lroc.sese.asu.edu/exhibits/A New Moon Rises/38
   9. https://skyandtelescope.org/observing/full-moon-is-tycho-time/
  10. https://apod.nasa.gov/apod/ap220715.html
  11. https://www.nasa.gov/mission_pages/LRO/multimedia/lroimages/lroc-20100114-tycho.html
  12. https://www.flickr.com/photos/136797589@N04/26945796059/
  13. https://en.wikipedia.org/wiki/Clavius_(crater)
  14. https://apod.nasa.gov/apod/ap220715.html
  15. https://apod.nasa.gov/apod/archivepix.html
  16. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  17. https://apod.nasa.gov/apod/lib/aptree.html
  18. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  19. https://apod.nasa.gov/apod/calendar/allyears.html
  20. https://apod.nasa.gov/apod.rss
  21. https://apod.nasa.gov/apod/lib/edlinks.html
  22. https://apod.nasa.gov/apod/lib/about_apod.html
  23. http://asterisk.apod.com/discuss_apod.php?date=220716
  24. https://apod.nasa.gov/apod/ap220717.html
  25. http://www.phy.mtu.edu/faculty/Nemiroff.html
  26. http://www.phy.mtu.edu/
  27. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  28. http://www.astro.umd.edu/
  29. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  30. https://www.nasa.gov/about/highlights/HP_Privacy.html
  31. https://astrophysics.gsfc.nasa.gov/
  32. https://www.nasa.gov/
  33. https://www.nasa.gov/centers/goddard/
  34. http://www.mtu.edu/