The life of a star is something I already know and I would like to teach other people who want to know about the life of a star.
A star is born from a nebula, (a cloud dust and gases including hydrogen and helium in space) That cloud eventually collapses under it's own gravitational pull. During that collapse the cloud gets hotter and hotter because of friction. Then eventually BOOM! The hydrogen and helium collide together and create nuclear fusion. That will continue to happen for millions of years. And whilst that is happening you have a star. But sadly your star will die.
The star will run out of nuclear energy and collapse becoming hotter because of gravity. Now even through the star has run out of helium there will still be hydrogen so on the out side there will be hydrogen fusion forming a sphere around the core and the very hot inside will push that sphere out where it cools and forms a red giant.
Stars like our sun will continue ejecting their sphere until the core is exposed. Those stars are called white dwarfs. And if there is another star close by to that star it might pull hydrogen from the other star therefor turning into a new star. Sometimes, mostly massive white dwarfs (those near the 1.4 solar
masses) may accumulat so much mass that
they collapse and explode entirely, creating a
supernova.
In the biggest stars, nuclear reactions create iron in the core. Having created this iron when it collapses it squishes that iron into an extremely small area and the outer layers of the star start to collapse along with the
core, they then rebound releasing an enormous amount energy that explodes outward. Supernova release so much energy that for days, sometimes weeks that they can outshine galaxys!
If the collapsing core contains
between around 1.4 and 3 solar masses, the collapse continues until
electrons and protons combine to create neutrons and produce a neutron star.
Neutron stars are extremely dense, like the density of an
atomic nucleus. and because it contains so much mass squished into such a
small area, the gravitational pull at the surface of a neutron star is
immense. An like the white dwarfs, if a neutron star forms in a
multiple star system it can accumulat gas by pulling it off nearby stars.
If the collapsed star is larger than three solar masses it completely collapses falling into an infinity small area so it has a gravitational pull so strong that nothing can pull away not even light! The fasted thing in the universe!
Thank you for reading.
The End.
Nebula
Star
Red giant
White dwarf
Black hole
Thank you NASA for teaching me on https://science.nasa.gov/astrophysics/focus-areas/how-do-stars-form-and-evolve
