The shapes that collapsing nebula take are a result of a combination of haphazard directions of movement and force responding to the initial motivating nudge from some external force and gravitational attraction and formation of clumps with in the nebula. The shape seen i.e. a blob, elliptical, etc. is in all probably a function of time with regard to the evolving motion and gravitational organization of matter with in the nebula.
The Helix Nebula is a planetary nebula located in the constellation Aquarius, while the Ring Nebula is a planetary nebula located in the constellation Lyra. The Helix Nebula appears more like a disk or helix shape, while the Ring Nebula appears as a ring or donut shape due to its orientation.
When the gas in the nebula's center stopped collapsing, it likely reached a stable equilibrium where the inward force of gravity was balanced by the outward pressure from nuclear fusion or other energy sources. This equilibrium could result in the formation of a protostar or a star, depending on the mass and composition of the gas.
When a nebula collapses due to gravitational forces, the center becomes denser and hotter. As the material in the center becomes more compact, the pressure and temperature increase, eventually triggering nuclear fusion reactions that sustain a star's energy. This marks the birth of a new star in the center of the collapsing nebula.
The conservation of angular momentum during the collapse of the primordial solar nebula is the aspect that accounts for the planets orbiting in the same direction and plane. As the nebula contracted and flattened into a spinning disk, this momentum caused the planets to form in a singular direction and plane, similar to the rotation of the original nebula.
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.
The pressure caused by the thermal energy of the gas within the nebula pushes outward in all directions, preventing the nebula from collapsing under its own gravity. This pressure acts to counterbalance the force of gravity, maintaining the nebula's size and structure.
If the nebula is gravitationally unstable, it collapsing & forming stars!
Gravity
Polio
The motions of the Sun and the planets reflect to disk shape of the solar nebula because they follow the same rotation as this disk shape. The rotation of the Sun and the planets is not a perfect circle.
gravity maybe?
Gravity pulls the particles in a nebula towards the center, trying to collapse it. However, pressure from gas and radiation within the nebula counteracts gravity, creating a balance that prevents collapse. This balance is crucial for the formation of stars from a nebula.
The Helix Nebula is a planetary nebula located in the constellation Aquarius, while the Ring Nebula is a planetary nebula located in the constellation Lyra. The Helix Nebula appears more like a disk or helix shape, while the Ring Nebula appears as a ring or donut shape due to its orientation.
A galaxy is formed when a nebula collapses under the force of gravity of the matter that it contains. The process of collapsing imparts a rotational momentum to the galaxy. It is this rotational motion which gives galaxies their characteristic disk shape.
Gravitational force pulls gas and dust particles together to form a nebula, while the outward pressure from gas particles pushing against each other (thermal pressure) prevents the nebula from collapsing under gravity. These two forces work together to stabilize a nebula.
Gravity is the force that causes nebulae to collapse. As particles within the nebula are pulled together by gravity, they begin to clump and form denser regions. This leads to the eventual formation of stars and planetary systems within the collapsing nebula.
A collapsing nebula spins faster due to the conservation of angular momentum. As the gas and dust within the nebula contract under gravitational forces, the material moves closer to the center, reducing its radius. Since angular momentum must be conserved, this decrease in radius leads to an increase in rotational speed, similar to how a figure skater spins faster when bringing their arms closer to their body.