August 15, 2023
In the grand ledger of cosmic time, a human life is breathtakingly brief. But brevity is not insignificance.
A Triply Glowing Night Sky over Iceland
Birthday · August 15, 2023
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APOD published August 15, 2023. Credit: Wioleta Gorecka; Text: Natalia Lewandowska (SUNY Oswego). A publication-date match, not a photo taken on your date. Independent of NASA.
The Sun is not the quiet place it seems. It expels an unsteady stream of energetic electrons and protons known as the solar wind. These charged particles deform the Earth's magnetosphere, change paths, and collide with atoms in Earth's atmosphere, causing the generation of light in auroras like that visible in green in the image left. Earth itself is also geologically active and covered with volcanoes. For example, Fagradalsfjall volcano in Iceland, seen emitting hot gas in orange near the image center. Iceland is one of the most geologically active places on Earth. On the far right is the Svartsengi geothermal power plant which creates the famous human-made Blue Lagoon, shown emitting white gas plumes. The featured composition therefore highlights three different sky phenomena, including both natural and human-made phenomena.
Image credit: Wioleta Gorecka; Text: Natalia Lewandowska (SUNY Oswego)