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 December 7
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                                Lines of Time
                Image Credit & [3]Copyright: [4]Anton Komlev

   Explanation: In time stars trace lines through the night sky [5]on a
   rotating planet. Taken over two hours or more, these digitally added
   consecutive exposures were made with a camera and wide angle lens fixed
   to a tripod near Orel farm, Primorsky Krai, Russia, planet Earth. The
   stars trail in concentric arcs around the planet's [6]south celestial
   pole below the scene's horizon, and north celestial pole off the frame
   at the upper right. Combined, the many short exposures also bring out
   the pretty star colours. Bluish trails are from stars hotter than
   Earth's Sun, while yellowish trails are from cooler stars. A long time
   ago this tree [7]blossomed, but now reveals the passage of time in the
   wrinkled and weathered lines of its remains.

                     Tomorrow's picture: lines in space
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    Authors & editors: [19]Robert Nemiroff ([20]MTU) & [21]Jerry Bonnell
                                 ([22]UMCP)
          NASA Official: Phillip Newman [23]Specific rights apply.
              [24]NASA Web Privacy Policy and Important Notices
                A service of: [25]ASD at [26]NASA / [27]GSFC
                           & [28]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/1912/LinesOfTimeKomlev.jpg
   3. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
   4. mailto: kom 86 [at] bk [dot] ru
   5. https://blogs.nasa.gov/
   6. https://apod.nasa.gov/apod/ap120802.html
   7. https://apod.nasa.gov/apod/ap150506.html
   8. https://apod.nasa.gov/apod/ap191206.html
   9. https://apod.nasa.gov/apod/archivepix.html
  10. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  11. https://apod.nasa.gov/apod/lib/aptree.html
  12. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  13. https://apod.nasa.gov/apod/calendar/allyears.html
  14. https://apod.nasa.gov/apod.rss
  15. https://apod.nasa.gov/apod/lib/edlinks.html
  16. https://apod.nasa.gov/apod/lib/about_apod.html
  17. http://asterisk.apod.com/discuss_apod.php?date=191207
  18. https://apod.nasa.gov/apod/ap191208.html
  19. http://www.phy.mtu.edu/faculty/Nemiroff.html
  20. http://www.phy.mtu.edu/
  21. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  22. http://www.astro.umd.edu/
  23. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  24. https://www.nasa.gov/about/highlights/HP_Privacy.html
  25. https://astrophysics.gsfc.nasa.gov/
  26. https://www.nasa.gov/
  27. https://www.nasa.gov/centers/goddard/
  28. http://www.mtu.edu/