Supernova Remnant
A supernova remnant is the structure resulting from the explosion of a massive star in a supernova event. It is composed of ejected material from the star, such as gas, dust, and heavy elements, expanding outwards at high velocities. Supernova remnants exhibit various features, including shock waves, filaments, and glowing nebulae, and play a crucial role in the dispersal of elements throughout the universe.