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<blockquote style="position: relative; padding-left: 55px;"><section><a href="https://mastodon.social/users/markmccaughrean/statuses/114008907986124122">Mark McCaughrean (markmccaughrean@mastodon.social)'s status on Sunday, 16-Feb-2025 05:42:08 JST</a><a href="https://mastodon.social/@markmccaughrean" title="markmccaughrean@mastodon.social"><img src="https://gnusocial.jp/avatar/40452-48-20221126151148.webp" width="48" height="48" alt="Mark McCaughrean" style="position: absolute; left: 0; top: 0;">Mark McCaughrean</a></section><article><p>I definitely wasn't supposed to be doing this this afternoon, but ... 🤷♂️🙂</p><p>A time lapse movie of the northern hemisphere of Saturn, showing a full rotation of the famous polar hexagon, a very cool fluid dynamics phenomenon in the planet's atmosphere 🪐🐻❄️</p><p>Taken by the NASA/ESA/ASI Cassini spacecraft over a 12.5 hour period on 3 &amp; 4 April 2014: 35 ISS WAC images 512x512 pixels, CB2 filter at 752nm 🛰️📷</p><p>Credit: NASA, JPL-Caltech, SSI, Mark McCaughrean</p><p><a href="https://mastodon.social/tags/SpaceScience" rel="tag">#SpaceScience</a></p></article><footer><a rel="bookmark" href="https://gnusocial.jp/conversation/4572562#notice-8951784">In conversation</a><time datetime="2025-02-16T05:42:08+09:00" title="Sunday, 16-Feb-2025 05:42:08 JST">about 6 days ago</time> <span>from <span><a href="https://mastodon.social/@markmccaughrean/114008907986124122" rel="external" title="Sent from mastodon.social via ActivityPub">mastodon.social</a></span></span><a href="https://mastodon.social/@markmccaughrean/114008907986124122">permalink</a><h4>Attachments</h4><ol><li><label><a rel="external" href="https://gnusocial.jp/attachment/4145205">A time lapse movie showing the northern hemisphere of Saturn rotating over a 12.5 hour period. There are atmospheric bands at lower latitudes, with small spots and storms too, and then close to the north pole, there is a giant hexagonal structure in the atmosphere. At its centre is a large vortex. The rings of Saturn are seen above the planet and the latter casts a shadow on the rings to the left. The data have been given a silver blue tint, even though they are original monochrome.</a></label><br><video poster="" controls="controls"><source src="https://files.mastodon.social/media_attachments/files/114/008/898/072/698/941/original/f1eaf32519155593.mp4" type="video/mp4"></source></video></li></ol></footer></blockquote>

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Mark McCaughrean (markmccaughrean@mastodon.social)'s status on Sunday, 16-Feb-2025 05:42:08 JST Mark McCaughrean
I definitely wasn't supposed to be doing this this afternoon, but ... 🤷♂️🙂
A time lapse movie of the northern hemisphere of Saturn, showing a full rotation of the famous polar hexagon, a very cool fluid dynamics phenomenon in the planet's atmosphere 🪐🐻❄️
Taken by the NASA/ESA/ASI Cassini spacecraft over a 12.5 hour period on 3 & 4 April 2014: 35 ISS WAC images 512x512 pixels, CB2 filter at 752nm 🛰️📷
Credit: NASA, JPL-Caltech, SSI, Mark McCaughrean
#SpaceScience
In conversationabout 6 days ago from mastodon.socialpermalink
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1. A time lapse movie showing the northern hemisphere of Saturn rotating over a 12.5 hour period. There are atmospheric bands at lower latitudes, with small spots and storms too, and then close to the north pole, there is a giant hexagonal structure in the atmosphere. At its centre is a large vortex. The rings of Saturn are seen above the planet and the latter casts a shadow on the rings to the left. The data have been given a silver blue tint, even though they are original monochrome.

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