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.

                                2025 June 15
   [2]Two images are shown side by side. On the left is a sunset seen from
   Earth, while on the right is a sunset seen from Mars. The Earth sunset
    is quite orange, while the Mars sunset is quite blue. The Sun appears
       angularly smaller from Mars than from the Earth. Please see the
                 explanation for more detailed information.

                             Two Worlds, One Sun
               Left Image Credit & Copyright: [3]Damia Bouic;
        Right Image Credit: [4]NASA, [5]JPL-Caltech, [6]MSSS; Digital
                         processing: [7]Damia Bouic

   Explanation: How different does sunset appear from Mars than from
   Earth? For comparison, two images of our common star were taken at
   [8]sunset, one from Earth and one from Mars. These images were scaled
   to have the same angular width and are [9]featured here side-by-side. A
   quick inspection will reveal that the [10]Sun appears slightly smaller
   from [11]Mars than from [12]Earth. This makes sense since [13]Mars is
   50% further from the [14]Sun than [15]Earth. More striking, perhaps, is
   that the [16]Martian sunset is noticeably bluer near the Sun than the
   [17]typically orange [18]colors near the setting Sun from Earth. The
   reason for the [19]blue hues from Mars is [20]not fully understood, but
   thought to be related to forward scattering properties of [21]Martian
   dust. The terrestrial sunset was taken in 2012 March from
   [22]Marseille, [23]France, while the Martian sunset was captured in
   2015 by [24]NASA's robotic [25]Curiosity rover from [26]Gale crater on
   [27]Mars.

     APOD Turns 30!: [28]Free Public Lecture in Cork, Ireland on June 24
                          Tomorrow's picture: S30E1
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    Authors & editors: [40]Robert Nemiroff ([41]MTU) & [42]Jerry Bonnell
                                 ([43]UMCP)
          NASA Official: Amber Straughn [44]Specific rights apply.
            [45]NASA Web Privacy, [46]Accessibility, [47]Notices;
                A service of: [48]ASD at [49]NASA / [50]GSFC,
                         [51]NASA Science Activation
                           & [52]Michigan Tech. U.

References

   1. https://apod.nasa.gov/apod/archivepix.html
   2. https://apod.nasa.gov/apod/image/2506/TwoWorldsOneSun_Bouic_2683.jpg
   3. https://www.planetary.org/profiles/damia-bouic
   4. https://www.nasa.gov/
   5. https://www.jpl.nasa.gov/
   6. https://www.msss.com/
   7. https://www.planetary.org/profiles/damia-bouic
   8. https://apod.nasa.gov/apod/ap140302.html
   9. http://www.db-prods.net/blog/2015/05/06/coucher-de-soleil-sur-mars/
  10. http://hudsonvalleygeologist.blogspot.com/2012/04/size-of-sun.html
  11. https://science.nasa.gov/mars/facts/
  12. https://apod.nasa.gov/apod/ap220206.html
  13. https://en.wikipedia.org/wiki/Mars
  14. https://science.nasa.gov/sun/
  15. https://science.nasa.gov/earth/
  16. https://www.planetary.org/articles/0506-sunset-on-mars
  17. https://apod.nasa.gov/apod/ap980526.html
  18. https://www.physicsclassroom.com/class/light/Lesson-2/Blue-Skies-and-Red-Sunsets
  19. http://en.wikipedia.org/wiki/Astronomy_on_Mars#The_color_of_the_sky
  20. http://www.dogtreatkitchen.com/image-files/dog_treat_ingredients.jpg
  21. https://en.wikipedia.org/wiki/Martian_soil#Atmospheric_dust
  22. https://youtu.be/G87bG7XzaPk
  23. https://en.wikipedia.org/wiki/France
  24. https://www.nasa.gov/
  25. https://science.nasa.gov/mission/msl-curiosity/
  26. https://en.wikipedia.org/wiki/Gale_(crater)
  27. https://www.youtube.com/watch?v=IXSIZcj8WgA
  28. https://corkastronomyclub.com/astronomy-picture-of-the-day-lecture/
  29. https://apod.nasa.gov/apod/ap250614.html
  30. https://apod.nasa.gov/apod/archivepix.html
  31. https://apod.nasa.gov/apod/lib/apsubmit2015.html
  32. https://apod.nasa.gov/apod/lib/aptree.html
  33. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search
  34. https://apod.nasa.gov/apod/calendar/allyears.html
  35. https://apod.com/feed.rss
  36. https://apod.nasa.gov/apod/lib/edlinks.html
  37. https://apod.nasa.gov/apod/lib/about_apod.html
  38. https://asterisk.apod.com/discuss_apod.php?date=250615
  39. https://apod.nasa.gov/apod/ap250616.html
  40. http://www.phy.mtu.edu/faculty/Nemiroff.html
  41. http://www.phy.mtu.edu/
  42. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
  43. http://www.astro.umd.edu/
  44. https://apod.nasa.gov/apod/lib/about_apod.html#srapply
  45. https://www.nasa.gov/about/highlights/HP_Privacy.html
  46. https://www.nasa.gov/general/accessibility/
  47. https://www.nasa.gov/privacy/
  48. https://astrophysics.gsfc.nasa.gov/
  49. https://www.nasa.gov/
  50. https://www.nasa.gov/centers/goddard/
  51. https://science.nasa.gov/learners
  52. http://www.mtu.edu/