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A protosun is a sun (star) that is still forming. It takes millions of years of solar winds and gravitational forces to gather and compress massive clouds of hydrogen to the point where it's gravity is powerful enough to cause nuclear fusion at it's core and "ignite" a new star.
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What is the definition for protosun?
The protosun refers to the early stage of the Sun during the formation of the solar system, when it was a pre-main-sequence star. It formed from the gravitational collapse of a region within a molecular cloud, eventually accumulating mass and heat. During this phase, the protosun emitted energy primarily through gravitational contraction rather than nuclear fusion, which only began when temperatures and pressures in its core became sufficiently high. This stage was crucial for the development of the surrounding protoplanetary disk from which planets and other solar system bodies formed.
What name is given to the concentration of mass that formed at the center of the solar nebula and eventually became the Sun?
The name given to the concentration of mass at the center of the solar nebula that eventually formed the Sun is the protosun or solar protostar. This dense core accumulated gas and dust, triggering nuclear fusion to ignite as a star.
What theory suggests that protoplanets began to form around the protosun from many collisions and combinations of gas and matter called what?
The nebular hypothesis proposes that protoplanets formed around the protosun in a protoplanetary disk through collisions and aggregations of gas and dust. This process, known as accretion, led to the formation of larger bodies from smaller ones over time.
How many steps are there in the formation of a Solar System?
The formation of a solar system typically involves several key steps: Nebula Collapse: A giant molecular cloud (nebula) collapses under its own gravity, forming a rotating disk of gas and dust. Protosun Formation: The central region of the disk gathers material to form a protosun, which will eventually ignite nuclear fusion. Planet Formation: Small particles collide and stick together, forming larger bodies called planetesimals, which then coalesce into planets and other celestial bodies. Clearing the Disk: The solar wind from the new star disperses remaining gas and dust, finalizing the solar system's structure. These steps can vary in complexity and duration depending on specific conditions.
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