Mysteries of the Universe

when a star is born it begins with a large cloud of gas and mostly hydrogen from the . These clouds begin to collapse under their own gravity and heat up. These proto-stars eventually become dense enough to sustain nuclear reactions (hydrogen becomes helium) the star becomes a hot giant ball of gas.

 

 

A star spends most of its time converting lighter elements into heavier elements (nuclear fusion) .in a state of "equilibrium” ( a state in which two opposite forces are balanced) The outward force of radiation from the star's core is exactly balanced by its own gravity which pulls it inwards. This balanced state is called hydrostatic equilibrium. this is what fuels up the star and keeps it together.