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--- blog:aardvaark:iotd [2020/06/28 08:53] – Phil Ide
+++ blog:aardvaark:iotd [2024/04/26 05:00] (current) – external edit 127.0.0.1
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 ~~NOCACHE~~
 ====== NASA Image of the Day ======
-Date: **Sun 28th June, 2020**\\
+Date: **Fri 26th April, 2024**\\
-Title: **Europa and Jupiter from Voyager 1**
+Title: **Regulus and the Dwarf Galaxy**
 === ===
-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.
+In northern hemisphere spring, bright star Regulus is easy to spot above the eastern horizon. The alpha star of the constellation Leo, Regulus is the spiky star centered in this telescopic field of view. A mere 79 light-years distant, Regulus is a hot, rapidly spinning star that is known to be part of a multiple star system. Not quite lost in the glare, the fuzzy patch just below Regulus is diffuse starlight from small galaxy Leo I. Leo I is a dwarf spheroidal galaxy, a member of the Local Group of galaxies dominated by our Milky Way Galaxy and the Andromeda Galaxy (M31). About 800 thousand light-years away, Leo I is thought to be the most distant of the known small satellite galaxies orbiting the Milky Way. But dwarf galaxy Leo I has shown evidence of a supermassive black hole at its center, comparable in mass to the black hole at the center of the Milky Way.
+[[https://apod.nasa.gov/apod/image/2404/Regulus_Dwarf_by_Markus_Horn2048.png|{{https://apod.nasa.gov/apod/image/2404/Regulus_Dwarf_by_Markus_Horn1024.png?800|Click image to enlarge}}]]
+Image copyright: Markus Horn<html><sup></html>(c)<html></sup></html>\\
+Click the image for a larger view (opens in a new tab)
-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.
+//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.//
-Sixteen frames from Voyager 1's flyby of Jupiter in 1979 were recently reprocessed and merged to create the featured image.
-About 43 years ago, Voyager 1 launched from Earth and started one of the greatest explorations of the Solar System ever.
-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~~