what determines whether a particular region of an interstellar cloud can collapse and form a star?

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What Determines Whether A Particular Region Of An Interstellar Cloud Can Collapse And Form A Star??

What determines whether a particular region of an interstellar cloud can collapse and form a star? overcoming of gas pressure, by self-gravity in a cold and dense interstellar cloud, to form a star.

What force S are responsible for the collapse of an interstellar cloud?

Summary: Stars form in cold, dense regions of space called molecular clouds. When the force of gravity pulling in on the cloud is greater than the strength of internal pressure pushing out, the cloud collapses into a protostar.

What prevents an interstellar cloud from just collapsing?

Magnetic pressure: Interstellar gas is pervaded by a magnetic field, and this magnetic field tends to become stronger when compressed and to counteract gravity. This pressure tends to resist collapse and retard star formation.

Which of the following must be occurring in order for a molecular cloud to collapse and form stars?

Answer: A cloud collapses and ultimately forms stars when gravity overcomes thermal pressure. The latter depends both on the density and temperature of the cloud.

How do stars form from the interstellar medium?

Stars are born in the interstellar medium by the gravitational collapse of gas and dust within interstellar molecular clouds which have mass many times greater than the mass of a single star.

What forces are responsible for the collapse of an interstellar cloud quizlet?

Terms in this set (47) Battle between pressure of heated gas and gravity. Gravity tries to squeeze an interstellar cloud into an even more compact form while the collapse and in-fall of the gas converts gravitational energy into the gas pressure, thereby slowing down the collapse.

Which factors resist the collapse of a cloud Choose all that apply?

Cards
Term What does star formation generally occur from?Definition the cores of giant molecular clouds
Term What are the four factors that resist the collapse of a cloud?Definition 1. thermal energy (pressure) 2. magnetic fields 3. rotation 4. turbulance
Term What is another word for rotation?Definition angular momentum

What does a collapsing cloud do as it shrinks?

As the cloud shrank, its gravitational potential energy was converted to kinetic energy and then into thermal energy. … However, as shown in the video, the nebular theory predicts that a cloud will rotate rapidly once it shrinks to a small size. What physical law explains why a cloud will rotate rapidly as it collapses?

What causes fragmentation in a collapsing interstellar cloud?

Figure 19.3 As an interstellar cloud contracts, gravitational instabilities cause it to fragment into smaller pieces. The pieces themselves continue to collapse and fragment, eventually to form many tens or hundreds of separate stars.

What causes a collapsing cloud fragment to flatten into a disk?

The initial spin of the cloud and the conservation of angular momentum result in the cloud flattening into a rapidly rotating disk. For the disk not to fly apart requires a larger mass to produce sufficiently strong gravity to hold the disk together.

What is an interstellar molecular cloud?

molecular cloud, also called dark nebula, interstellar clump or cloud that is opaque because of its internal dust grains. The form of such dark clouds is very irregular: they have no clearly defined outer boundaries and sometimes take on convoluted serpentine shapes because of turbulence.

What is necessary for molecular clouds to form?

A molecular cloud is an accumulation of interstellar gas and dust. … Such a density can only occur if the temperatures are very low, otherwise the thermal pressure of the gas would lead to an expansion of the dark nebula and no new stars would be able to form.

Which of the following must be occurring in order for a molecular cloud to collapse and form stars quizlet?

The strength of gravity within a molecular cloud depends on… Which of the following must be occurring in order for a molecular cloud to collapse and form stars? The buildup of thermal energy in a collapsing gas cloud leads to thermal pressure that can halt the gravitational collapse.

How does a star collapse?

Gravity constantly works to try and cause the star to collapse. The star’s core, however is very hot which creates pressure within the gas. This pressure counteracts the force of gravity, putting the star into what is called hydrostatic equilibrium.

What does the interstellar medium consist of?

In a nutshell, the interstellar medium is the material that fills the space between stars. 99% of the interstellar medium is made up of (mostly hydrogen) gas and the rest is composed of dust. The interstellar medium is vast and expansive in size but very, very low in density.

Where does interstellar medium come from?

The interstellar medium begins where the interplanetary medium of the Solar System ends. The solar wind slows to subsonic velocities at the termination shock, 90–100 astronomical units from the Sun. In the region beyond the termination shock, called the heliosheath, interstellar matter interacts with the solar wind.

Which process can initiate an interstellar cloud collapse and trigger stellar formation?

In triggered star formation, one of several events might occur to compress a molecular cloud and initiate its gravitational collapse. Molecular clouds may collide with each other, or a nearby supernova explosion can be a trigger, sending shocked matter into the cloud at very high speeds.

What could trigger the collapse of an interstellar cloud to form protostars quizlet?

What are thought to be some possible causes of triggering the contraction of an interstellar cloud? the cloud become too cold to balance the inward force of gravity. From the release of gravitational energy as the protostar shrinks in stages 2 and 3.

What causes fragmentation in a collapsing interstellar cloud quizlet?

As an interstellar cloud contracts, gravitational instabilities cause it to fragment into smaller pieces. … It prevents the charged particles in the cloud from moving in certain directions and can slow or even halt the gravitational collapse of a molecule cloud.

What four factors cause a cloud of interstellar matter to resist contraction select all that apply?

The stars form from the dust and gas of the interstellar medium. The gravitational attraction in giant molecular clouds makes the cloud contraction when enough mass has accumulated. The gravitational attraction opposes by the magnetic fields, rotation of clouds, thermal energy, and turbulence of the gas.

What triggers the gravitational collapse of material inside a molecular cloud quizlet?

What triggers the gravitational collapse of material inside a molecular cloud? A passing shock wave. What eventually halts the slow contraction of a newly forming star? Nuclear fusion.

What evidence can you cite that the interstellar medium contains both gas and dust quizlet?

What evidence can you cite that the interstellar medium contains both gas and dust? Interstellar medium (The gas and dust distributed between stars). Very hot stars can excite clouds of gas and dust to emit light, and this reveals that the clouds contain mostly hydrogen gas at very low densities.

What changes happened to the cloud from which our solar system formed as it diminished in size due to gravitational collapse?

According to our theory of solar system formation, what three major changes occurred in the solar nebula as it shrank in size? It got hotter, its rate of rotation increased, and it flattened into a disk.

Why does a cloud collapse rapidly at first and then slow down as it gets denser?

6) Why does a cloud collapse rapidly at first, and then slow down as the it gets denser? Answer: The self-gravity causes the cloud to collapse. Gravitational potential energy is turned to heat (through friction) and released as infrared light from the cloud.

Which law best explains why the central regions of the solar nebula got hotter as the nebula shrank in size?

According to our theory of solar system formation, which law best explains why the central regions of the solar nebula got hotter as the nebula shrank in size? … It flattened as a natural consequence of collisions between particles in the nebula.

What is the source of energy as a star evolves from an interstellar cloud to the protostar stage quizlet?

stars form when an interstellar cloud collapses under its own gravity and breaks up into pieces comparable in mass to our sun. heat, rotation, and magnetism all compete with gravity to influence the cloud’s evolution.

Why does fragmentation occur in molecular clouds?

The dense cores that form stars through gravitational collapse are embedded in much larger and more rarefied expanses of gas. How the parent molecular cloud produces its substructure of dense cores is the problem of fragmentation. The traditional view is that the parent cloud breaks apart as it collapses in on itself.

What is the key factor that determines the temperature density radius luminosity?

formation and evolution
QuestionAnswer
What is the key factor that determines the temperature, density, radius, luminosity, and pace of evolution for a prestellar object?mass
The most abundant substance in a molecular cloud isH2.
Protostars are located on the H–R diagramabove and to the right of the main sequence.

What happens when an interstellar cloud fragment shrinks quizlet?

What happens when an interstellar cloud fragment shrinks? It first becomes opaque; Density rises; Temperature rises; Pressure rises. … its luminosity decreases, while its temperature increases.

Which concept describes how a molecular cloud spins faster and flattens into a disk?

History of the Nebular Hypothesis:

In this treatise, he argued that gaseous clouds (nebulae) slowly rotate, gradually collapsing and flattening due to gravity and forming stars and planets.

What is interstellar cloud of gas and dust?

An interstellar cloud is generally an accumulation of gas, plasma, and dust in our and other galaxies. … An interstellar cloud is formed by the gas and dust particles from a red giant in its later life.

What are the compositions of interstellar clouds?

7 Interstellar Space Applications. The region between the stars contains interstellar clouds composed primarily of dust and gas. Over 100 molecules (neutrals, ions, and radicals), mostly carbon-containing compounds, have been identified in interstellar molecular clouds.

Where do stars form and why?

Stars form inside relatively dense concentrations of interstellar gas and dust known as molecular clouds. These regions are extremely cold (temperature about 10 to 20K, just above absolute zero). At these temperatures, gases become molecular meaning that atoms bind together.

What happens to the rotation of a molecular cloud as it collapses to form a star?

What happens to the rotation of a molecular cloud as it collapses to form a star? The rotation rate increases and results in a disk of material around a protostar.

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