Linked from
The 46 pages that link to Supernova, each with the reason it gives.
Small Magellanic CloudRelated: Supernovae enrich its interstellar gas and drive energetic flows.
Galactic windRelated: Overlapping supernovae can heat interstellar gas and drive it out of a galaxy.
StarRelated: Some massive stars end in supernovae that disperse newly formed elements.
Circumstellar mediumRelated: Its ejecta collide with material lost by the star before the explosion.
PSR B1937+21Related: A supernova produced the neutron star that became PSR B1937+21.
Intergalactic dustRelated: Supernovae produce dust and drive some grains out of galaxies.
Sculptor GalaxyRelated: Supernovae help heat and accelerate the gas flowing from NGC 253's core.