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@ APOD
2025-06-09 04:07:38
**Astronomy Picture of the Day**
09 June 2025
**Between Scylla and Charybdis: A Double Cosmic Discovery**
https://apod.nasa.gov/apod/image/2506/ScyllaB_LerouxGere_2094.jpg
*Image creditor details unavailable via API. Visit linked page below for full info.*
Can you identify this celestial object? Likely not — because this is a discovery image. Massive stars forge heavy elements in their cores and, after a few million years, end their lives in powerful supernova explosions. These remnants cool relatively quickly and fade, making them difficult to detect. To uncover such faint, previously unknown supernova remnants, a dedicated group of amateur astrophotographers searched through sky surveys for possible supernova remnant candidates. The result: the first-ever image of supernova remnant G115.5+9.1 — named Scylla by its discoverers—glowing faintly in the constellation of the mythological King of Aethiopia: Cepheus. Emission from hydrogen atoms in the remnant is shown in red, and faint emission from oxygen is shown in hues of blue. Surprisingly, another discovery lurked to the upper right: a faint, previously unknown planetary nebula candidate. In keeping with mythological tradition, it was named Charybdis (Sai 2) — a nod to the ancient Greek expression "caught between Scylla and Charybdis" from Homer’s Odyssey.
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https://apod.nasa.gov/apod/ap250609.html