This belongs in astronomy.
It's a theory of how solar systems have come to be.
Basically, clouds of gas draw together and form an accretion disc (which lies in a plane equal to the planets' axes).
In the center a sun is created from the large amount of particles gathering there.
Elsewhere particles gather and form larger particles, which collide and gain size over time.
After a long, long time a solar system has been created.
All the details are not known, and this was probably the most simplistic explanation of the theory possible, try searching for accretion disc.
A theory may be revised or discarded in the future if new evidence emerges that contradicts its predictions, if it fails to explain or account for new phenomena, or if a more comprehensive and predictive theory is developed that encompasses its core principles. Additionally, changes in scientific paradigms, advancements in technology, or shifts in scientific consensus can also drive revisions or discarding of theories.
A quasar is a highly energetic and luminous region at the center of a distant galaxy. It appears as a point-like source of light that can outshine an entire galaxy due to the accretion of material onto a supermassive black hole at its core.
Planets are, in general, by-products of the birth of a star. As the stars form from accretion, so do the planets. Heavy elements like iron and even the heaviest elements at the upper end of the periodic table can become part of a planet's core. The core of a planet usually exists of these heavy elements. The pressure and isolation from the upper layers of the planet cause the core to stay molten and hot. Though not all planetary cores are hot, some are, and we might look at Earth to figure out how a planet's core gets hot. There are three things that contribute to the Earth's core temperature. The original formation of the Earth by accretion created heat when gravity compressed the material. We also see that bombardment of the planet by asteroids and other matter which created tremendous heat which has not completely cooled. In the case of the earth, the major impact that formed the moon would have re-melted the surface if it had begun to solidify at that point. The other sources of heat are the friction/movement of the various parts and substances. This can be due to crustal shift or the strong gravity of a nearby mass periodically compressing the planet. The is also the fact that the primary source of Earth's core heat (90+%) is from the radioactive decay of radioactive materials in the core. A planet's core is hot because of residual heat of formation, or from friction generated by repeated compression by a nearby massive body, or from impacts of other bodies, or from the natural shifts of crustal material, or from the decay of radioactive materials within it.
A solar nebula begins to form a solar system when a region of a molecular cloud, composed of gas and dust, experiences a disturbance, such as a nearby supernova explosion or the collision of galaxies. This disturbance causes the cloud to collapse under its own gravity, leading to an increase in density and temperature at the core. As the core contracts, it forms a protostar, while the surrounding material flattens into a rotating disk, where planets, moons, and other celestial bodies begin to form through processes of accretion.
The core of Mars is cooler than the Earth. Why depends on the surface area relative to the volume of a planet. A larger planet like Earth has a lot of volume and a limited amount of surface area by which to radiate its internal heat to space. Mars is smaller but has more surface area per volume than Earth, so it can radiate its internal heat away to space more efficiently than Earth. There are other smaller differences in the initial heat of accretion and the heat released when the core forms from an initially homogeneous mass, but the surface area is the biggest factor. like none of this has an actual temperature
It is called accretion. The term is also used for the formation of a stellar disk that begins the process of forming planets around a star.
The three main theories on the origin of the Earth are the nebular hypothesis, the giant impact hypothesis, and the core accretion theory. The nebular hypothesis proposes that the solar system formed from a rotating cloud of dust and gas, while the giant impact hypothesis suggests that Earth formed from a collision between a Mars-sized protoplanet and the early Earth. The core accretion theory posits that planets formed from the gradual accumulation of solid particles in a protoplanetary disk.
From incredible pressures, residual accretion heat, and nuclear reactions. == ==
Core Accretion theory posits that planets form through the gradual accumulation of solid materials, such as dust and ice, within a protoplanetary disk surrounding a young star. As these particles collide and stick together, they create larger bodies known as planetesimals, which eventually coalesce into protoplanets. Over time, these protoplanets can attract additional gas, leading to the formation of gas giants, while terrestrial planets remain primarily rocky. This theory contrasts with the alternative model of disk instability, emphasizing a more gradual and orderly process of planetary formation.
Core population theory proposes that a society's survival is dependent on a core group within the population maintaining social order and stability. This theory suggests that this core group is responsible for maintaining the social norms and values of the society, ensuring its continuity and prosperity.
Dynamo theory is the idea that a magnetic field generator exists within the Earth's outer core. It is this generator that explains the difference between the inner and outer core.
core population theory defines the numbers of people in a country however, many people in the world increases by its numbers such as in a community.
Dynamo theory is the idea that a magnetic field generator exists within the Earth's outer core. It is this generator that explains the difference between the inner and outer core.
The central engine of a quasar contains a supermassive black hole at its core, which is surrounded by an accretion disk of hot gas and dust. The intense gravitational forces and high temperatures within the accretion disk lead to the emission of powerful electromagnetic radiation, making quasars some of the brightest objects in the universe.
There isn't one.
We don't have any facts to form a theory on that.
Gravitational instability theory, is a theory that the Jovian planets are formed directly from the instabilities within the gasses around them which leads to gravitational collapse. This makes one of the four giant outer planets of the solar system, which resembles Jupiter in physical and chemicalcomposition.gravitational instabability theory -- gas and dust sticks to itself and colapses.core accretion theory -- a core of rock and ice attracts gasses.