Kanishka NaikSupernovae come in two types. Core-collapse supernovae result from massive stars exhausting fuel. Thermonuclear supernovae are triggered by white dwarfs accreting mass or merging. Both produce expanding SNRs that can leave neutron stars or black holes.
Without SNRs, rocky planets like Earth could not have formed. SNRs inject supernova ejecta containing elements like carbon, oxygen, silicon, and iron into the interstellar medium. This enriched gas becomes the raw material for subsequent generations of stars and planetary systems.
SNR W49B is a well-studied composite remnant about 1,000 years old. Chandra X-ray data show asymmetric iron distribution and a barrel-shaped structure, consistent with a jet-driven asymmetric explosion. It may host the most recently formed black hole in the Milky Way galaxy.