What forms the expanding cloud known as a Supernova Remnant (SNR)?
Answer
The ejected stellar material combined with gas and dust swept up from the interstellar medium.
A supernova remnant (SNR) is characterized as the expansive, temporary structure formed in the immediate aftermath of a star's death. It is specifically constituted by two primary components: the material physically ejected outwards from the star during the violent supernova explosion, and the existing interstellar medium—the gas and dust present in the galaxy—that is subsequently swept up and energized by the resulting shock wave. This mixture of materials heats up significantly, causing the entire structure to emit radiation across the electromagnetic spectrum.
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