Stars, planets, solar systems, many objects in space can start as a large unstructured nebula of gas and dust, which can coalesce into massive objects under gravitational influence.
Star formation starts in a nebula.
A solar nebula begins to form when a cloud of gas and dust in space collapses under its own gravity. This collapse can be triggered by a nearby supernova explosion, a shockwave from a passing star, or other disturbances in the interstellar medium.
After a nebula, the next stage in the life cycle of a star is usually a protostar, where gravity causes the gas and dust within the nebula to begin collapsing and forming a dense core. Following this stage, the protostar may evolve into a main sequence star, where nuclear fusion begins in its core and it enters a stable period of energy production.
A star forms a nebula when it runs out of fuel. The star either becomes a red giant or a supergiant, then the star would be blown off into space either by expansion or explosion. The outer layers, which was released into space, would become a nebula, or sometimes a part of a larger nebula.
I have no idea. If a star is born within a nebula, how or why would it be compelled to leave it, since the gravity of everything inside the nebula would seem to hold it in there? So it doesn't make sense that a star like the sun would ever leave the nebula. Of course there is probably an explanation, but not one that I can find online very easily
Star formation starts in a nebula.
As a nebula, a cloud of gas and dust.
nebula? navicular
the horsehead nebula
begins to collapse under its own gravity due to a disturbance, such as a shockwave from a nearby supernova. As the nebula collapses, it heats up and the particles within it start to come together, initiating the formation of a protostar.
a nebula
Nebula
Gas and dust in a nebula is disturbed by an outside force
helium and hydrogen gases
Gas and dust in a nebula is disturbed by an outside force
What begins the process of solar system formation? Gas and dust in a nebula is disturbed by an outside force. Apex
This stage is called protostar formation. As the nebula collapses due to gravity, it begins to spin faster and forms a hot, dense core known as a protostar. This marks the beginning of the process that will eventually lead to the formation of a new star.