Arjoo Yadav's Key Ideas from Neutron Stars: Theory and Observation
by J.E Ventura

Turbulence within a single core leads to multiple dense clumps. These clumps independently collapse to form stars that orbit each other. Gravitational instabilities in a massive accretion disk cause the formation of a similar, secondary disk within the first ,resulting in two stars that orbit each other.

It's easily possible to have 8,9,or even greater numbers of stars all bound together in the same system for millions or even billions of years.

Stars die because they exhaust their nuclear fuel. Once there is no fuel left, the star collapse and the outer layers explode as a 'supernova ' what's left over after a supernova explosion is a neutron star- the collapsed core of the star -or, if there's sufficient mass, a black hole.

Stars are mainly made of hydrogen and helium gas. In the centre of a star ,the temperature and pressure are so high that four protons can fuse to form helium, in a series of steps. This process releases huge amount of energy and makes the star shine brightly. At beginning of their life , stars burn hydrogen.