inner and outer balance makes it.
They collided and stuck together.
Hydrogen and Helium
I have no idea. If a star is born within a nebula, how or why would it be compelled to leave it, since the gravity of everything inside the nebula would seem to hold it in there? So it doesn't make sense that a star like the sun would ever leave the nebula. Of course there is probably an explanation, but not one that I can find online very easily
it is not the it is a stellar nebula considering that there are multiple stellar nebulas in the universe. what a steller nebula is though is dust and such maing a nebula then when the nebula is strong enough to make a star is creates a prostar, then it is either a massive star or a non massive star. soon they will either turn into a super giant or a red giant. then either the star will explode or simply poof then either it is a white dwarf a neutron star or a black hole. the end
That is called an accretion disk or a proto-Solar system.
A nucleus is stable if the electrostatic and strong nuclear forces balance out.
Matter from nebula that condense make proto star.
Planets.
After a planetary nebula the oxygen in the middle will make it turn into a blackhole or neutron star.
No
The gas molecules interact with one another
Go to stable at the bottom of the page and click on make your own stable.
They collided and stuck together.
Hydrogen and Helium
Two hydrogen make Oxygen stable.
Neon has completely filled orbitals. hence it is stable.
Yes, but it can also make a black hole or a white dwarf.