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The center of a rotating disk star, often referred to as a protostar or the stellar core, is primarily formed by the gravitational collapse of gas and dust within a molecular cloud. As material accumulates, it begins to spin due to conservation of angular momentum, leading to the formation of a flattened disk structure. The intense pressure and temperature in the core eventually ignite nuclear fusion, marking the birth of a new star. This process is crucial for the star's evolution and subsequent development into a main-sequence star.
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How do spiral galaxies form?
Spiral galaxies form from the collapse of a protogalactic cloud. Spiral galaxies consist of three components: a rotating disk, a bulge and a halo. Spiral galaxies, like the Milky Way, owe their shape to stars inside the protogalaxy developing at different intervals. The gas between forming stars continues to be compressed, and the resulting gravitational differences manhandle the protogalaxy's stars, dust and gas. When the protogalactic cloud collapses, the stars in the bulge and halo form first. These stars have rather random orbits around the galactic center. The galactic center probably contains a supermassive black hole, which likely exerts some gravitational influence on the formation of a spiral galaxy. The remainder of the cloud forms a disk due to the conservation of angular momentum (the same effect as the spinning up of the dancer when she pulls her arms inside). This motion forces everything into a rotating disk, and additional differences in gravity build the spiral arms. Oppositely, when a protogalaxy's stars develop at the same time, you have an elliptical galaxy on your hands. The stars in the disk form later and thus the disk population of stars are younger than those in the bulge and the halo. Further, the stars in the disk rotate around the center of the galaxy in a collective, well defined way unlike the stars in the bulge and halo.
Can you have a hypothesis for a solar system?
Yes, a hypothesis for a solar system could be: "If a star has a rotating disk of gas and dust around it, then planets will form within this disk as the materials accrete and coalesce under the influence of gravity, eventually forming a stable system of orbiting bodies."
Explain why the material surrounding a young star forms a disk?
The prograde rotation of the collapsing cloud of gas and dust results in conservation of angular momentum, causing the material to flatten into a disk shape. This disk of material, known as a protoplanetary disk, is where planets are thought to form through the process of accretion and gravitational interactions.
Is the star at the center of our solar system?
The Sun is at the Center of our Solar system. and yes, the sun is a star
Why is the center of a collapsing nebula forms a star?
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.
What is a protoplanetary disk?
A disk of gas ad dust that forms round a proto-star as the star coalesces at the center and from which planets accurate. The related links below give more information.
Why material surrounding a young star forms a disk?
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What is the dense center of a stellar nebula after it spins into a disk shape?
A "proto-star".
What is The disk of dust and gas that formed the sun and planets called?
This disk of dust and gas that formed the sun and planets is called the solar nebula. It is a rotating cloud of gas and dust left over from the formation of a star. Over time, the particles in the nebula began to clump together and form planetesimals, eventually leading to the formation of planets.
When a star is forming why doesn't all the material in the disk fall into the center?
The material in the disk has too much angular momentum to fall into the center and instead remains in orbit.
What main conclusion did the Herschels draw from their star counts?
The Milky Way is a disk of stars with the sun near the center.
What will happen to a starfish that loses an arm?
A sea star can grow a new one, because it's attached to the center disk!
What is a dense rotating star?
A pulsar.
How do spiral galaxies form?
Spiral galaxies form from the collapse of a protogalactic cloud. Spiral galaxies consist of three components: a rotating disk, a bulge and a halo. Spiral galaxies, like the Milky Way, owe their shape to stars inside the protogalaxy developing at different intervals. The gas between forming stars continues to be compressed, and the resulting gravitational differences manhandle the protogalaxy's stars, dust and gas. When the protogalactic cloud collapses, the stars in the bulge and halo form first. These stars have rather random orbits around the galactic center. The galactic center probably contains a supermassive black hole, which likely exerts some gravitational influence on the formation of a spiral galaxy. The remainder of the cloud forms a disk due to the conservation of angular momentum (the same effect as the spinning up of the dancer when she pulls her arms inside). This motion forces everything into a rotating disk, and additional differences in gravity build the spiral arms. Oppositely, when a protogalaxy's stars develop at the same time, you have an elliptical galaxy on your hands. The stars in the disk form later and thus the disk population of stars are younger than those in the bulge and the halo. Further, the stars in the disk rotate around the center of the galaxy in a collective, well defined way unlike the stars in the bulge and halo.
Can you have a hypothesis for a solar system?
Yes, a hypothesis for a solar system could be: "If a star has a rotating disk of gas and dust around it, then planets will form within this disk as the materials accrete and coalesce under the influence of gravity, eventually forming a stable system of orbiting bodies."
Why is a nebula rotating?
Because the star that blew it off of itself was rotating. Conservation of rotational momentum.
Is the sun a disk star?
Yes, the sun is a type of star known as a G-type main-sequence star, commonly referred to as a yellow dwarf star. It is not a disk star, which typically refers to stars located within the disk of a galaxy, like the Milky Way.
