Being an Astrophysicist must be fun. You get to make stuff up about something you've never seen ... kinda like my 4-year old does.
No one’s ever “seen” an electron, or a proton or a neutron. Or a neutron star or a black hole.
We infer their existence by applying the known “laws of physics” to observations.
Dirac “made up” anti-matter. According to his theory, it could exist, so he said it should exist. Turns out it does exist.
You are more correct than you realize. Let me explain. The Scientific Method is merely a formalization of the reasoning process that most of us go through in life. Your 4 year old (I have one too), invents theories about things. As he gains knowledge and wisdom, if the theory pans out, he keeps it. If not, it is discarded. Whats great about it, is that it self correcting, and it works.