nebular
The nebular model explains
I think you mean "protoplanet hypothesis". In fact, astronomers usually call it the Nebular Hypothesis A protoplanet is a planet-like object that hasn't fully developed into a planet. Why that hypothesis? It's because it is the best we have to describe the origin of the solar system according to the Laws of Physics.
The plural of hypothesis is hypotheses.
a nebular creates stars as it caves in by its own gravity!
nebular
That is the correct spelling of "hypothesis" (conjecture, proposition).
Nebular. has written: 'Felines' -- subject(s): Erotic comic books, strips
in a nebular
your second guess other than the first one.
eventually a sentient being with some free time
The answer is Nebular Theory