Differences

This shows you the differences between two versions of the page.

--- blog:aardvaark:iotd [2020/06/28 08:40] – external edit
+++ blog:aardvaark:iotd [2024/04/23 05:00] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
 ~~NOCACHE~~
 ====== NASA Image of the Day ======
-Date: **Sun 28th June, 2020**\\
+Date: **Tue 23rd April, 2024**\\
-Title: **Europa and Jupiter from Voyager 1**
+Title: **Contrail Shadow X**
 === ===
-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.
+What created this giant X in the clouds? It was the shadow of contrails illuminated from below. When airplanes fly, humid engine exhaust may form water droplets that might freeze in Earth's cold upper atmosphere.
-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.
+These persistent streams of water and ice scatter light from the Sun above and so appear bright from below. On rare occasions, though, when the Sun is near the horizon, contrails can be lit from below.
-Sixteen frames from Voyager 1's flyby of Jupiter in 1979 were recently reprocessed and merged to create the featured image.
+These contrails cast long shadows upwards, shadows that usually go unseen unless there is a high cloud deck. But that was just the case over Istanbul, Türkiye, earlier this month. Contrails occur all over planet Earth and, generally, warm the Earth when the trap infrared light but cool the Earth when they efficiently reflect sunlight. The image was taken by a surprised photographer in the morning on the way to work.
+[[https://apod.nasa.gov/apod/image/2404/ContrailX_Ekmen_2268.jpg|{{https://apod.nasa.gov/apod/image/2404/ContrailX_Ekmen_960.jpg?800|Click image to enlarge}}]]
+Image copyright:
+Fatih Ekmen
+<html><sup></html>(c)<html></sup></html>\\
+Click the image for a larger view (opens in a new tab)
-About 43 years ago, Voyager 1 launched from Earth and started one of the greatest explorations of the Solar System ever.
+//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.//
-  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)
 ~~socialite~~
 ~~DISCUSSION~~