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.

                              2019 November 11
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                    Lunar Craters Langrenus and Petavius
           Image Credit & Copyright: [3]Eduardo Schaberger Poupeau

   Explanation: The history of the Moon is partly written in its craters.
   Pictured here is a lunar panorama taken from Earth featuring the large
   craters [4]Langrenus, toward the left, and [5]Petavius, toward the
   right. The craters formed in separate [6]impacts. [7]Langrenus spans
   about 130 km, has a terraced rim, and sports a central peak rising
   about 3 km. [8]Petavius is slightly larger with a 180 km diameter and
   has a distinctive fracture that runs out from its center. Although it
   is known that Petravius crater is about 3.9 [9]billion years old, the
   origin of its large [10]fracture is unknown. The craters are best
   visible a few days after a [11]new Moon, when [12]shadows most greatly
   accentuate vertical walls and hills. The [13]featured image is a
   composite of the [14]best of [15]thousands of high-resolution,
   [16]infrared, video images taken through a small telescope. Although
   mountains on [17]Earth will likely erode into soil over a billion
   years, [18]lunar craters Langrenus and Petavius will likely survive
   many billions more years, possibly until the Sun expands and
   [19]engulfs both the [20]Earth and [21]Moon.

    Watch: the November 11 Transit of Mercury [22]from Earth or [23]from
                                   Space.
                   Tomorrow's picture: spiraling sideways
     __________________________________________________________________

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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/1911/PetaviusLangrenus_Poupeau_3000.jpg
   3. https://www.facebook.com/astrofotografiarafaela/
   4. https://en.wikipedia.org/wiki/Langrenus_(crater)
   5. https://en.wikipedia.org/wiki/Petavius_(crater)
   6. https://apod.nasa.gov/apod/ap010428.html
   7. http://lroc.sese.asu.edu/posts/453
   8. http://lunarnetworks.blogspot.com/2012/12/lroc-petavius.html
   9. https://en.wikipedia.org/wiki/Lunar_geologic_timescale
  10. https://moon.nasa.gov/resources/371/fractured-crater/
  11. https://spaceplace.nasa.gov/dr-marc-moon-phases/en/
  12. https://www.themadcatlady.com/wp-content/uploads/2012/10/SAM_1629.jpg
  13. https://www.facebook.com/astrofotografiarafaela/photos/a.407916176064535/1072090396313773/?type=3&theater
  14. https://en.wikipedia.org/wiki/Lucky_imaging
  15. https://www.youtube.com/watch?v=488OSfvqIcM
  16. https://science.nasa.gov/ems/07_infraredwaves
  17. https://epod.usra.edu/
  18. https://www2.lpod.org/wiki/Main_Page
  19. https://www.scientificamerican.com/article/the-sun-will-eventually-engulf-earth-maybe/
  20. https://solarsystem.nasa.gov/planets/earth/overview/
  21. https://solarsystem.nasa.gov/moons/earths-moon/overview/
  22. https://earthsky.org/tonight/transit-of-mercury-on-november-11-2019
  23. http://sdoisgo.blogspot.com/2019/10/mercury-transit-november-11-2019.html
  24. https://apod.nasa.gov/apod/ap191110.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=191111
  34. https://apod.nasa.gov/apod/ap191112.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/