How small can a star be conmpressed?the size of an atom or the size of a Neutron?

Answer 1

Science doesn't know how small a volume a star can ultimately be compressed. If the star has enough mass it will compress into a black hole, but exactly what the spatial diameter at the center of a black hole might be isn't known. When science applies any appropriate equations of physics to such an object the solutions are nonsense, like a singularity lies at the center of a black hole, except that a singularity is a point of zero volume containing infinite mass!

In other words, there's currently no answer to your question : (

Answer 2

The material that makes up a star can be compressed into neutrons (thus neutron star), if a star has mass large enough to produce degenerate neutrons, it will become a black hole, in which case you will need to ask another question like "what is a singularity?" .

Answer 3

A star with enough mass can be collapsed into a black hole which has the mass compresed into a singularity or a point the size of a quark. The event horizon can be several hundereds of thousands of miles across.

Answer 4

it's mass becomes so large that it sort-of implodes, I think.
This is where black holes come from (their so dense that not even light can escape)

Answer 5

It can be compressed nearly infinitely when it dies. Thus, the black hole