This is the best summary I could come up with:

It took a long time before astronomers using modern telescopes were able to find the remnant of this supernova, but they finally did so in the last decade.

This image combines X-ray, optical, and infrared wavelengths to bring the remnant to life.

Studies of the composition of the different parts of the remnant have led scientists to believe that it was formed in a thermonuclear explosion, and more precisely a special kind of supernova called a sub-luminous Type Iax event.

During this event two white dwarf stars merged, and typically no remnant is expected for this kind of explosion.

The combination of the star and the nebula makes it a unique opportunity for studying such rare explosions.

The Chandra Observatory, by the way, faces steep budget cuts despite the fact that it remains operational.

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Cosmic sphincter