An explosion of a large star of mass greater than 8 times that of our Sun caused by exhaustion of its supply of nuclear fuel.
Collisions between the black holes at the centers of large galaxies that cause the stars near them to explode.
Concentrated, intense star-formation activity occurs within galaxies as a result of gravitational interactions with other galaxies or other internal instability.
Collisions between two or more stars that yield a larger star, which then bursts in a supernova explosion.
A brilliant flash of light caused by the explosion of the black hole within a star or set of stars.