CTB 1: The Medulla Nebula—A Supernova Remnant in Cassiopeia

CTB 1: The Medulla Nebula—A Supernova Remnant in Cassiopeia

What powers this unusual nebula? 

CTB 1 is the expanding gas shell that was left when a massive star toward the constellation of Cassiopeia exploded about 10,000 years ago. The star likely detonated when it ran out of elements, near its core, that could create stabilizing pressure with nuclear fusion. 

Distance from Earth: ~10-14,000 light years

The resulting supernova remnant, nicknamed the Medulla Nebula for its brain-like shape, still glows in visible light because of the heat generated by its collision with confining interstellar gas. Why the nebula also glows in X-ray light, though, remains a topic of research. One hypothesis holds that an energetic pulsar was created and powers the nebula with a fast outwardly moving wind. Following this lead, a pulsar was found in radio waves that appears to have been expelled by the supernova explosion at over 1,000 kilometers per second. Although the Medulla Nebula appears as large as a full moon, it is so faint that it took 84 hours of exposure with a small telescope in the American state of Texas to create the featured image.

Image Credit: Pierre Konzelmann

Pierre's website: https://app.astrobin.com/u/konzy
Release Date: Jan. 19, 2026

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