In a supernova, the core of a massive star collapses under its own gravity, triggering a violent explosion.

Type II supernovae occur when massive stars undergo core collapse and expel their outer layers.

The core of a massive star collapses to form a neutron star, an incredibly dense object composed of neutrons.

Type Ia supernovae occur when a white dwarf accretes mass from a companion star and undergoes a runaway thermonuclear reaction.

SN 1987A was a Type II supernova that occurred in the Large Magellanic Cloud in 1987.

Iron is the heaviest element that can be produced in large quantities during a supernova explosion.

The actual explosion of a supernova lasts only a few seconds, although the aftermath can be visible for months or even years.

Tycho Brahe observed a new star in the constellation Cassiopeia in 1572, which is now known to have been a supernova.

SN 1054 was a supernova that occurred in 1054 and is associated with the Crab Nebula.

Type II supernovae can result in the formation of black holes if the core of the star is sufficiently massive.

The nearest known supernova remnant is Cassiopeia A, located approximately 1,000 light-years away.

Type II supernovae are responsible for the production of heavy elements through the process of nucleosynthesis.

The Chicxulub impactor is believed to have been a comet or asteroid that collided with Earth 66 million years ago, causing the extinction of the dinosaurs.

Type II supernovae can result in the formation of neutron stars if the core of the star is sufficiently massive.

The approximate frequency of supernovae in our galaxy is once every 100 years.