Why doesn’t the stuff just falls in towards the center? It just floats there??

Thanks to blackbody radiation, every human skydiver briefly becomes a star by this definition! ;)

It needs a core generating energy through fusion, which has density requirements, for what it’s worth.

The outer boundary is the point where a photon has a ~50% chance of escaping without encountering another particle.

The radius is based on visual observation. We have good theories and models about what's happening inside the star. We are quite sure that it's mostly empty space inside the radius. But that's not a good enough reason to say that the star's radius is anything other than what we see through our telescope.

Averages are quite misleading. The core is obviously a lot denser. Our sun has an average energy output per cubic meter that is comparable to a compost heap.

So a locomotive floats. Interesting.

Was also a fan of Anton but professor Dave recently made a video about him.

https://youtu.be/dst-C0IDQRU

Anton is definitely wonderful! He explains everything very well with no drama and BS. High information density and yet very clear!

We don't have a good fuel source or reason for expansion. We also don't know where all the theorized white holes could be.

To me it's an interesting coincidence, thought description of these objects baffles me.

Unless the universe is recursively within itself: the black hole stars have black holes within them that also exit at the big bang. But then so do all other smaller big bangs we see: exact same exit point and coincidentally, the same moment in time.

Oh, and there is a beautiful symmetry here: only one white hole exists.

One beginning, many endings. It's armchair philosophy but fun to imagine.