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--- blog:aardvaark:iotd [2020/06/28 08:55] – Phil Ide
+++ blog:aardvaark:iotd [2025/06/29 04:59] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
 ~~NOCACHE~~
 ====== NASA Image of the Day ======
-Date: **Sun 28th June, 2020**\\
+Date: **Sun 29th June, 2025**\\
-Title: **Europa and Jupiter from Voyager 1**
+Title: **Dark Sand Cascades on Mars**
 === ===
-What are those spots on Jupiter? Largest and furthest, just right of center, is the Great Red Spot -- a huge storm system that has been raging on Jupiter possibly since Giovanni Cassini's likely notation of it 355 years ago.
+Are these trees growing on Mars? No.
-It is not yet known why this Great Spot is red. The spot toward the lower left is one of Jupiter's largest moons: Europa. Images from Voyager in 1979 bolster the modern hypothesis that Europa has an underground ocean and is therefore a good place to look for extraterrestrial life. But what about the dark spot on the upper right? That is a shadow of another of Jupiter's large moons: Io. Voyager 1 discovered Io to be so volcanic that no impact craters could be found.
+Groups of dark brown streaks have been photographed by the Mars Reconnaissance Orbiter on melting pinkish sand dunes covered with light frost. The featured image was taken in 2008 April near the North Pole of Mars. At that time, dark sand on the interior of Martian sand dunes became more and more visible as the spring Sun melted the lighter carbon dioxide ice.
-Sixteen frames from Voyager 1's flyby of Jupiter in 1979 were recently reprocessed and merged to create the featured image.
+When occurring near the top of a dune, dark sand may cascade down the dune leaving dark surface streaks -- streaks that might appear at first to be trees standing in front of the lighter regions but cast no shadows. Objects about 25 centimeters across are resolved on this image spanning about one kilometer. Close ups of some parts of this image show billowing plumes indicating that the sand slides were occurring even while the image was being taken.
-About 43 years ago, Voyager 1 launched from Earth and started one of the greatest explorations of the Solar System ever.
+  Celestial Surprise: What picture did APOD feature on your birthday? (post 1995)
+[[https://apod.nasa.gov/apod/image/2506/almosttrees_mro_2560.jpg|{{https://apod.nasa.gov/apod/image/2506/almosttrees_mro_960.jpg?800|Click image to enlarge}}]]
-Free Download: Voyager Posters
-[[https://apod.nasa.gov/apod/image/2006/EuropaJupiter_Voyager_2792.jpg|{{https://apod.nasa.gov/apod/image/2006/EuropaJupiter_Voyager_960.jpg?800|Click image to enlarge}}]]
 \\
 Click the image for a larger view (opens in a new tab)
+//If you leave a comment below, please enter the date when referring to images. I can go back and fetch images for a specific date if you request it.//
 ~~socialite~~
 ~~DISCUSSION~~