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.
Extra debris was swept out away from our solar system by the sun's radiation and solar wind towards the end of the formation of our solar system.
What begins the process of solar system formation? Gas and dust in a nebula is disturbed by an outside force. Apex
Remnants of the formation of the solar system include asteroids, comets, and minor planets located mainly in the asteroid belt between Mars and Jupiter. These objects provide valuable information about the early stages of the solar system's formation. Additionally, the distribution of heavy elements in the solar system's planets and moons also reflects the processes that occurred during its formation.
The first stage of the formation of the solar system was the collapse of a giant molecular cloud composed mostly of hydrogen and helium. Gravitational forces caused the cloud to contract, leading to the formation of a protostar at the center.
In the formation of our solar system, nearly all the mass of the solar nebula became the Sun, which accounts for about 99.86% of the solar system's total mass. The remaining material formed the planets, moons, asteroids, and comets. This process involved the gravitational collapse of the nebula, leading to the Sun's formation at the center, while the residual matter coalesced into the various celestial bodies orbiting it.
The formation of sun is the most important part of solar system formation. Sun is the reason for formation of rocky planets.
Extra debris was swept out away from our solar system by the sun's radiation and solar wind towards the end of the formation of our solar system.
the solar role
Most object that are currently in the Solar System are such remnants.
star formation and protoplanitery disks the solar system formed 4.5-4.6 billions ago
Some rocks are younger then the formation of the solar system because of changes caused by volcanic activity
The formation of our solar system was triggered by the collapse of a giant molecular cloud, leading to the creation of the Sun and its surrounding planets.
What begins the process of solar system formation? Gas and dust in a nebula is disturbed by an outside force. Apex
Life?
Remnants of the formation of the solar system include asteroids, comets, and minor planets located mainly in the asteroid belt between Mars and Jupiter. These objects provide valuable information about the early stages of the solar system's formation. Additionally, the distribution of heavy elements in the solar system's planets and moons also reflects the processes that occurred during its formation.
Almost everything in the solar system at this time. Planets, Moons.
the nebular theory