¿ 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. 2020 August 2 [2]See Explanation. Clicking on the picture will download the highest resolution version available. 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 same angular width and [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 [17]noticeably bluer near the Sun than the [18]typically orange [19]colors near the setting Sun from Earth. The reason for the [20]blue hues from Mars is [21]not fully understood, but thought to be related to forward scattering properties of [22]Martian dust. The terrestrial sunset was taken in 2012 March from [23]Marseille, [24]France, while the Martian sunset was [25]captured in 2015 by [26]NASA's robotic [27]Curiosity rover from [28]Gale crater on [29]Mars. Last week a [30]new rover and a [31]helicopter -- onboard [32]Mars 2020 -- [33]launched for Mars. Tomorrow's picture: gaping comet __________________________________________________________________ [34]< | [35]Archive | [36]Submissions | [37]Index | [38]Search | [39]Calendar | [40]RSS | [41]Education | [42]About APOD | [43]Discuss | [44]> __________________________________________________________________ Authors & editors: [45]Robert Nemiroff ([46]MTU) & [47]Jerry Bonnell ([48]UMCP) NASA Official: Phillip Newman [49]Specific rights apply. [50]NASA Web Privacy Policy and Important Notices A service of: [51]ASD at [52]NASA / [53]GSFC & [54]Michigan Tech. U. References 1. https://apod.nasa.gov/apod/archivepix.html 2. https://apod.nasa.gov/apod/image/2008/TwoWorldsOneSun_Bouic_2683.jpg 3. https://twitter.com/db_prods 4. https://www.nasa.gov/ 5. https://www.jpl.nasa.gov/ 6. https://www.msss.com/ 7. https://twitter.com/db_prods 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. http://mars.nasa.gov/allaboutmars/facts/ 12. https://apod.nasa.gov/apod/ap070325.html 13. https://en.wikipedia.org/wiki/Mars 14. https://solarsystem.nasa.gov/solar-system/sun/overview/ 15. https://solarsystem.nasa.gov/planets/earth/overview/ 16. https://www.planetary.org/blogs/guest-blogs/2015/0506-sunset-on-mars.html 17. https://mars.jpl.nasa.gov/MPF/science/clouds.html 18. https://apod.nasa.gov/apod/ap980526.html 19. https://www.physicsclassroom.com/class/light/Lesson-2/Blue-Skies-and-Red-Sunsets 20. http://en.wikipedia.org/wiki/Astronomy_on_Mars#The_color_of_the_sky 21. http://www.dogtreatkitchen.com/image-files/dog_treat_ingredients.jpg 22. https://en.wikipedia.org/wiki/Martian_soil#Atmospheric_dust 23. https://youtu.be/G87bG7XzaPk 24. https://en.wikipedia.org/wiki/List_of_communes_in_France_with_over_20,000_inhabitants 25. http://www.db-prods.net/blog/2015/05/06/coucher-de-soleil-sur-mars/ 26. https://www.nasa.gov/ 27. https://mars.nasa.gov/msl/ 28. https://en.wikipedia.org/wiki/Gale_%28crater%29 29. https://www.youtube.com/watch?v=IXSIZcj8WgA 30. https://www.nasa.gov/perseverance 31. https://mars.nasa.gov/technology/helicopter/ 32. https://mars.nasa.gov/mars2020/mission/overview/ 33. https://youtu.be/VWD-nx9gA0o 34. https://apod.nasa.gov/apod/ap200801.html 35. https://apod.nasa.gov/apod/archivepix.html 36. https://apod.nasa.gov/apod/lib/apsubmit2015.html 37. https://apod.nasa.gov/apod/lib/aptree.html 38. https://antwrp.gsfc.nasa.gov/cgi-bin/apod/apod_search 39. https://apod.nasa.gov/apod/calendar/allyears.html 40. https://apod.nasa.gov/apod.rss 41. https://apod.nasa.gov/apod/lib/edlinks.html 42. https://apod.nasa.gov/apod/lib/about_apod.html 43. http://asterisk.apod.com/discuss_apod.php?date=200802 44. https://apod.nasa.gov/apod/ap200803.html 45. http://www.phy.mtu.edu/faculty/Nemiroff.html 46. http://www.phy.mtu.edu/ 47. https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html 48. http://www.astro.umd.edu/ 49. https://apod.nasa.gov/apod/lib/about_apod.html#srapply 50. https://www.nasa.gov/about/highlights/HP_Privacy.html 51. https://astrophysics.gsfc.nasa.gov/ 52. https://www.nasa.gov/ 53. https://www.nasa.gov/centers/goddard/ 54. http://www.mtu.edu/