{"id":194759,"url":"https://www.kudos365.com/news/194759-moon-and-smoke-rings-from-mt-etna","short_url":"https://www.kudos365.com/news/194759","headline":"Moon and Smoke Rings from Mt. Etna","content":"\u003cp\u003eNASA Astronomy Picture of the Day:\u003c/p\u003e\n\n\u003cp\u003eYes, but can your volcano do this? To the surprise of some, Mt. Etna emits, on occasion, smoke rings. Technically known as vortex rings, the walls of the volcano slightly slow the outside of emitted smoke puffs, causing the inside gas to move faster.  A circle of low pressure develops so that the emitted puff of volcanic gas and ash loops around in a ring, a familiar geometric structure that can be surprisingly stable as it rises. Smoke rings are quite rare and need a coincidence of the right geometry  of the vent, the right speed of ejected smoke, and the relative calmness of the outside atmosphere.  In the featured image taken about two weeks ago from Gangi, Sicily, Italy, multiple volcanic smoke rings are visible.  The scene is shaded by the red light of a dawn Sun, while a crescent Moon is visible in the background.\u003c/p\u003e\n\n\n\n\u003cp\u003ePhoto by \nDario Giannobile\n\u003c/p\u003e","content_plain":"NASA Astronomy Picture of the Day:\n\nYes, but can your volcano do this? To the surprise of some, Mt. Etna emits, on occasion, smoke rings. Technically known as vortex rings, the walls of the volcano slightly slow the outside of emitted smoke puffs, causing the inside gas to move faster.  A circle of low pressure develops so that the emitted puff of volcanic gas and ash loops around in a ring, a familiar geometric structure that can be surprisingly stable as it rises. Smoke rings are quite rare and need a coincidence of the right geometry  of the vent, the right speed of ejected smoke, and the relative calmness of the outside atmosphere.  In the featured image taken about two weeks ago from Gangi, Sicily, Italy, multiple volcanic smoke rings are visible.  The scene is shaded by the red light of a dawn Sun, while a crescent Moon is visible in the background.\n\n\n\nPhoto by \nDario Giannobile\n","published_at":"2024-04-22T12:16:00-07:00","updated_at":"2026-07-07T18:04:22-07:00","author":{"type":"Person","name":"Specola-","url":"https://www.kudos365.com/profiles/298285-specola"},"description":"Stay up-to-date with Specola on Kudos365. View their photo published Apr/22/2024 on Science - Tech - Astronomy. Browse your favorite topics and share your expertise, too.","type":"photo","image":"https://k365pi.imgix.net/c55e4ed6-6833-4254-9c74-ddc7e7abb97c.jpg?auto=compress,format\u0026fit=max\u0026w=1200\u0026h=1200\u0026q=48","likes_count":4,"categories":[{"name":"Science - Tech - Astronomy","url":"https://www.kudos365.com/categories/986-science-tech-astronomy"}],"schema":{"@context":"https://schema.org","@type":"CreativeWork","url":"https://www.kudos365.com/news/194759-moon-and-smoke-rings-from-mt-etna","headline":"Moon and Smoke Rings from Mt. Etna","image":"https://k365pi.imgix.net/c55e4ed6-6833-4254-9c74-ddc7e7abb97c.jpg?auto=compress,format\u0026fit=max\u0026w=1200\u0026h=1200\u0026q=48","author":{"@type":"Person","name":"Specola-","url":"https://www.kudos365.com/profiles/298285-specola"},"datePublished":"2024-04-22T12:16:00-07:00","interactionStatistic":[{"@type":"InteractionCounter","interactionType":"https://schema.org/LikeAction","userInteractionCount":4}],"subjectOf":[{"@type":"Thing","name":"Science - Tech - Astronomy","url":"https://www.kudos365.com/categories/986-science-tech-astronomy"}]}}