Has there ever been documented proof of a Black Hole, Worm Hole, or Neutron Star?
You might be interested in this. In it they describe a "proof" of the existence of the central black hole in our galaxy. As you know, "proof" simply means very strong support and is still tenative but becoming more certain every day.
Worm holes are simply constructs and TTBOMK, none have ever been observed.
And here is an article on measurements taken that suggest that Neutron Stars can be very small. They were able to measure the ratio of mass to radius for the object.
Aslan is not a Tame Lion