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.

                                2024 March 22
    [2]See Explanation. Clicking on the picture will download the highest
                        resolution version available.

                           Phobos: Moon over Mars
   Image Credit: [3]NASA, [4]ESA, Zolt Levay ([5]STScI) - Acknowledgment:
                    J.Bell ([6]ASU) and M.Wolff ([7]SSI)

   Explanation: [8]A tiny moon with a scary name, Phobos emerges from
   behind the Red Planet in this timelapse sequence from the
   Earth-orbiting [9]Hubble Space Telescope. Over 22 minutes the 13
   separate exposures were captured near the 2016 closest [10]approach of
   Mars to planet Earth. [11]Martians have to look to the west to watch
   Phobos rise, though. The small moon is closer to its [12]parent planet
   than any other moon in the Solar System, about 3,700 miles (6,000
   kilometers) [13]above the Martian surface. It completes one orbit in
   just 7 hours and 39 minutes. That's faster than a Mars rotation, which
   corresponds to about 24 hours and 40 minutes. So on Mars, Phobos can be
   seen to rise above the western horizon 3 times a day. Still, [14]Phobos
   is doomed.

                   Tomorrow's picture: Ares 3 Landing Site
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    Authors & editors: [26]Robert Nemiroff ([27]MTU) & [28]Jerry Bonnell
                                 ([29]UMCP)
          NASA Official: Amber Straughn [30]Specific rights apply.
               [31]NASA Web Privacy, [32]Accessibility Notices
                A service of: [33]ASD at [34]NASA / [35]GSFC,
                         [36]NASA Science Activation
                           & [37]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2403/STSCI-MarsPhobosComp3000.jpg
   3. http://www.nasa.gov/
   4. http://www.spacetelescope.org/
   5. http://www.stsci.edu/
   6. https://sese.asu.edu/
   7. http://www.spacescience.org/
   8. https://www.nasa.gov/feature/goddard/2017/hubble-sees-martian-moon-orbiting-the-red-planet
   9. http://hubblesite.org/
  10. https://apod.nasa.gov/apod/ap160809.html
  11. https://apod.nasa.gov/apod/ap150516.html
  12. https://apod.nasa.gov/apod/ap031024.html
  13. https://apod.nasa.gov/apod/ap031129.html
  14. https://apod.nasa.gov/apod/ap121028.html
  15. https://apod.nasa.gov/apod/ap240321.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=240322
  25. https://apod.nasa.gov/apod/ap240323.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://www.nasa.gov/general/accessibility/
  33. https://astrophysics.gsfc.nasa.gov/
  34. https://www.nasa.gov/
  35. https://www.nasa.gov/centers/goddard/
  36. https://science.nasa.gov/learners
  37. http://www.mtu.edu/