What Happens When An Interstellar Cloud Fragment Shrinks?


What Happens When An Interstellar Cloud Fragment Shrinks??

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.

What are the events of a collapsing interstellar cloud?

Summary. Many examples of star forming regions are observed in space. Stars form when an interstellar cloud collapses under its own gravity heats and breaks into pieces of star-sized masses. The evolution of the protostar can be represented as a path on the Hertzsprung-Russell diagram.

Why do stellar fragments shrink?

The cores are denser than the outer cloud so they collapse first. As the cores collapse they fragment into clumps around 0.1 parsecs in size and 10 to 50 solar masses in mass.

What would happen to a contracting cloud fragment?

What would happen to a contracting cloud fragment if it were not able to radiate away its thermal energy? – Its internal pressure would increase which fights gravity because pressure pushes it out. … – The spinning cloud flattens as it shrinks and is required for planet rotation.

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.

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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.

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.

Why did the nebula spin faster as they shrink or collapse?

As a ball of dust and gas contracts under its own gravity it begins to shrink and its core begins collapsing faster and faster. This causes the core to heat up and to rotate.

What will happen if the cloud does not have enough mass?

Some objects in space are created from clouds of gas and dust. What will happen if the cloud does not have enough mass? A core will form. … Gravity pulls gas and dust together.

How can a star lose mass?

All stars lose some mass over their lives at widely varying rates. Triggering events can cause the sudden ejection of a large portion of the star’s mass. Stellar mass loss can also occur when a star gradually loses material to a binary companion or into interstellar space.

What would happen to a contracting cloud fragment if it were not able to radiate?

What would happen to a contracting cloud fragment if it were not able to radiate away its thermal energy? It would continue contracting but its temperature would not change.

How long does it take to form a star like the Sun from a nebula?

The process of star formation takes around a million years from the time the initial gas cloud starts to collapse until the star is created and shines like the Sun.

What happens to the gases given off during a supernova quizlet?

What remains after a supernova explosion is called a supernova remnant. This is the star’s outer layers that were blasted into space during the supernova. The gases expand out from the star at incredible speeds and excite the gaseous atoms around it causing it to glow as a nebula.

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 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.

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

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

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Why does a nebula collapse?

The dust and gases in a nebula are very spread out but gravity can slowly begin to pull together clumps of dust and gas. As these clumps get bigger and bigger their gravity gets stronger and stronger. Eventually the clump of dust and gas gets so big that it collapses from its own gravity.

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 shrinking gas cloud heat up?

Shrinking gas clouds heat up because the gravitational potential energy of gas particles far from the cloud center is converted into thermal energy as the gas moves inward.

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.

Why do cloud fragments heat up as they contract due to gravity quizlet?

The heat generated as the clouds contract due to gravity is lost as photons. The photons are generated by the molecules’ rotational and vibrational energy levels which are excited by collisions between molecules. … Since the clouds would have been warmer the clouds would have had to form larger fragments to collapse.

Which of the processes can initiate the collapse of an interstellar cloud and trigger the formation of stars?

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 happens to a collapsed star as its radius becomes smaller?

The star collapses by its own gravity and the iron core heats up. … In less than a second the iron core which is about the size of Earth shrinks to a neutron core with a radius of about 6 miles (10 kilometers). The outer layers of the star fall inward on the neutron core thereby crushing it further.

Is a nebula bigger than a galaxy?

Simply put the main difference between galaxies and nebulae are an extreme difference in size as well as their basic structure. A nebula is a cloud of dust and gas usually tens to hundreds of light years across. A galaxy is much larger — usually thousands to hundreds of thousands of light years across.

Is a galaxy bigger than a universe?

Galaxies come in many sizes. The Milky Way is big but some galaxies like our Andromeda Galaxy neighbor are much larger. The universe is all of the galaxies – billions of them! … Our Milky Way Galaxy is one among the billions of galaxies in our Universe.

What happens first when a star begins to run out of fuel the star’s core shrinks the star becomes a black hole the star becomes a white dwarf?

If the star is large enough it can go through a series of less-efficient nuclear reactions to produce internal heat. However eventually these reactions will no longer generate sufficient heat to support the star agains its own gravity and the star will collapse.

What happens when a star begins to run out of fuel?

It is now known as a main sequence star. When a main sequence star begins to run out of hydrogen fuel the star becomes a red giant or a red supergiant. … The core of the star that is left behind cools and becomes a white dwarf. The white dwarf eventually runs out of fuel and dies as a black dwarf.

What will happen if the cloud does not have enough mass quizlet?

What will happen if the cloud does not have enough mass? A star will not form. Which event signals the birth of a star? Extreme heat and pressure causes nuclear fusion.

Does black hole have gravity?

Black holes are points in space that are so dense they create deep gravity sinks. Beyond a certain region not even light can escape the powerful tug of a black hole’s gravity.

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How is a stellar black hole created?

How Do Black Holes Form? … Stellar black holes form when the center of a very massive star collapses in upon itself. This collapse also causes a supernova or an exploding star that blasts part of the star into space. Scientists think supermassive black holes formed at the same time as the galaxy they are in.

Why does a pulsar pulse?

Pulsars have very strong magnetic fields which funnel jets of particles out along the two magnetic poles. These accelerated particles produce very powerful beams of light. … Partway through the point-of-view changes so that we can see the beams of light sweeping across our line of sight – this is how a pulsar pulses.

Why do we think that clouds of gas and dust form stars?

Gravity causes a cloud of gas and dust to begin to contract. … Computer models predict that if a cloud has enough mass it will contract from the pull of gravity heat up and form a star.

How would that life story be different if the protostar formed in a cloud without any angular momentum?

How would that life story be different if the protostar formed in a cloud without any angular momentum? There would be no protostellar disk or jets and probably no protostellar winds. If a binary is to be formed in such a cloud it would be a close binary.

What types of stars end their lives with supernovae?

Supernovae are most likely to form in stars that are at least eight times the mass of our Sun while the most massive stars may not form at all. Stars with a mass of at least eight times that of our Sun are more likely to finish their lives as supernovae.

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