There is no maximum number, and "nebular theory" has been knocked for a loop by the recent discoveries of 400+ "extra-solar planets" - planets orbiting other stars.
Classical theories predicted that planetary systems would be rare; however, it seems that every nearby star we've looked at recently has been discovered to have planets - LOTS of planets.
Somebody had an idea, built up a theory, and started publishing it!
Most of these are a result of giant impacts
Our current theory of the formation of our solar system is that the planets formed more or less in their present orbits. We do not believe that the planets (with the exception of Pluto) were "captured" by the Sun's gravity.
Copernicus's theory was called the Heliocentric Theory. It said that the Earth and planets orbited around the sun, and the Sun was the center of the universe. The previous theory, mainly advocated by the Catholic Church, was called the Geocentric Theory; which stated that the Sun and planets orbited around the Earth, and that the Earth was the center of the Universe.
According to modern understanding, the planets, and the Sun, move around the Solar System's center of mass. Since the Sun is much more massive than the planets, this center of mass is very close to the Sun. If the Sun is much larger than any of the planets, it seems likely that it also has a greater mass - assuming that their respective densities are somewhat similar. And indeed, this is the case here.
the nebular theory
nebular theory
jovian planets can form only in the cold, outer regions of a solar system
The three theories of the formation of the solar system are the nebular theory, the planetesimal hypothesis, and the gravitational instability theory. The nebular theory proposes that the solar system formed from a rotating disk of dust and gas, while the planetesimal hypothesis suggests that small, solid bodies collided and accreted to form planets. The gravitational instability theory proposes that clumps of material in a protoplanetary disk collapsed under their gravity to form planets.
The steps of the Nebular Theory consist of: The collapse of the nebula and formation of the protoplanetary disk and protosun. The condensation of planetessimals. The Accretion of planetessimals to form planet seeds. The Formation of Jovian planets through nebular capture and the solar wind of young sun clears away the remaining gas.
No, nobody uses the term "solar galactic hypothesis". You may be referring to a "solar nebula", in which a cloud of gas and dust collapses under its internal gravity to form a star and perhaps some planets.
The protoplanetary nebular model is a theory that describes how planetary systems form from a disk of gas and dust surrounding a young star. According to this model, the planets form as material within the disk accretes onto planetesimals, which eventually grow into planets through collisions and gravitational interactions. This model is widely accepted in planetary science for explaining the formation of our own solar system and others.
The main difference between the nebular and condensation theories is their emphasis on different aspects of planet formation. Nebular theory focuses on the collapse of a rotating nebula to form a star and planets, while condensation theory emphasizes the role of solid particles (dust and gas) in the early stages of planet formation.
The formation of the solar system from a huge cloud of dust and gases is called solar nebular hypothesis. This theory suggests that a rotating disk of gas and dust collapsed under its own gravity, forming the Sun and planets.
The nebular theory was proposed by the French mathematician and astronomer Pierre-Simon Laplace in the 18th century. The theory suggests that the solar system formed from a giant rotating cloud of gas and dust, known as a nebula.
The most widely accepted model for the formation of the solar system is the nebular hypothesis. This theory suggests that the solar system formed from a rotating mass of gas and dust known as the solar nebula, which collapsed under its own gravity to form the Sun and surrounding planets approximately 4.6 billion years ago.
The nebular hypothesis is a widely-accepted theory that explains the formation of the solar system. It suggests that the Sun and planets formed from a spinning disk of gas and dust called a solar nebula. As the nebula contracted due to gravity, it flattened into a disk and the Sun formed at the center, while planets and other celestial bodies formed from material in the disk.