What constitutes the immediate and visually striking aftermath known as a supernova remnant (SNR)?
Answer
Expanding, illuminated cloud of ejected stellar material slamming into the ISM.
The supernova remnant (SNR) represents the visible, expanding aftermath of a massive star's violent death. It is formed when the stellar material ejected during the explosion slams into the surrounding interstellar medium (ISM). This collision creates a shockwave that heats the gas to millions of degrees, causing it to glow brightly. Although the initial explosion is instantaneous, this illuminated cloud structure can persist for tens of thousands of years as it slowly disperses and mixes with the galaxy.
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After A Supernova Event, What Is Left Behind? - Physics Frontier
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