GENERAL KNOWLEDGE

Detailed explanation-1: -The core collapses in a heartbeat, and the energy generated in that collapse is so immense that it blows the outer layers off. This explosion is so colossal it can outshine an entire galaxy!

Detailed explanation-2: -Either the core of the star weighs more than about 3 solar masses when it begins to collapse, in which case a black hole will form directly; or enough additional matter falls onto a newborn neutron star so that its mass increases above the maximum limit.

Detailed explanation-3: -Some smaller stars are big enough to go supernova, but too small to become black holes-they’ll collapse into super-dense structures called neutron stars after exploding as a supernova.

Detailed explanation-4: -After two separate stars underwent supernova explosions, two ultra-dense cores (that is, neutron stars) were left behind. These two neutron stars were so close that gravitational wave radiation pulled them together until they merged and collapsed into a black hole.