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 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.
What could trigger the collapse of an interstellar cloud to form protostars?
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.
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 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 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 process prevents the continued gravitational collapse of the gas cloud?
How are stars divided? Where are star born? How do stars form? Where do stars form?
What is the force that keeps a main sequence star from blowing apart what is the force that keeps a main sequence star from blowing apart?
Nuclear reactions begin in the core by stage 4. What is the force that keeps a main sequence star from collapsing on itself? radiation pressure.
What is the force that keeps a main sequence star from blowing up?
Stars on the main sequence are those that are fusing hydrogen into helium in their cores. The radiation and heat from this reaction keep the force of gravity from collapsing the star during this phase of the star’s life.
What force is responsible for starting the process of star formation in cold molecular clouds?
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.
Which factors resist the collapse of a cloud?
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 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.
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.
What caused the nebula to collapse and start spinning?
Shock waves from the explosion compressed the cloud of gas and dust. Compression made the cloud collapse, as gravity pulled the gas and dust together, forming a solar nebula. Just like a dancer that spins faster as she pulls in her arms, the cloud began to spin as it collapsed.
What causes nebula to collapse?
Irregularities in the density of the gas causes a net gravitational force that pulls the gas molecules closer together. Some astronomers think that a gravitational or magnetic disturbance causes the nebula to collapse. As the gases collect, they lose potential energy, which results in an increase in temperature.
What forces are responsible for the formation of stars?
gravity is the force responsible for the formation of a star.
Which of the following counteract the inward force of gravity in a collapsing interstellar cloud?
rotation is able to counteract the inward pull caused by gravity, which causes material, including gas, to fly off into space.
What force pulls matter together to form these regions?
Gravity is the force that pulls matter together – it is an attractive force that acts on masses. It acts on the dust and gas together.
What force causes particles in a nebula to condense over time?
According to the nebula hypothesis, the Solar System began as a nebula, an area in the Milky Way Galaxy that was a swirling concentration of cold gas and dust. Due to some perturbation, possibly from a nearby supernova, this cloud of gas and dust began to condense, or pull together under the force of its own gravity.Why does the rotation rate increase as an interstellar cloud collapses?
Contraction of insterstellar cloud. Solar system formed about 4.6 billion year ago, when gravity pulled together low-density cloud of interstellar gas and dust (called a nebula)(movie). … As collapse proceeded, the rotation speed of the cloud was gradually increasing due to conservation of angular momentum.
What forces a star like the Sun to evolve off the main sequence?
One-Solar Post-Main Sequence Evolution. Stars such as our Sun move off the main sequence and up the red giant branch (RGB), fusing hydrogen into helium in hydrogen shell burning. A very short helium flash sees the start of helium core fusion and the star moves along the horizontal branch (HB).What is the inward force that counteracts the outward force of heat in a star’s core?
Energy is generated in the star’s hot core, then carried outward to the cooler surface. Inside a star, the inward force of gravity is balanced by the outward force of pressure. The star is stabilized (i.e., nuclear reactions are kept under control) by a pressure-temperature thermostat.
What needs to happen to the interstellar medium in order to initiate star formation?
STAR FORMATION
- Stars form when dense clumps of interstellar gas collapse gravitationally.
- The collapsing gas heats up and becomes a protostar.
- A protostar stops collapsing when nuclear fusion begins in its center.
What object is formed from the gravitational collapse of a giant molecular cloud quizlet?
Stars form in giant molecular clouds. They are given this name because they are cold and dense enough for hydrogen to form hydrogen molecules, forming “molecular clouds”, of which stars form within. The disk that formed after the fragment of a molecular cloud collapsed (Planets formed from this Disk).
Why are most stars main sequence stars?
So, broadly speaking, there are so many stars on the main sequence – compared to elsewhere in the H-R diagram – because stars spend much more of their lives burning hydrogen in their cores than they do producing energy in any other way!What process marks the birth of a star quizlet?
What process marks the “birth” of a star? A star is born from a protostar when the protostar becomes hot enough for nuclear fusion in its core to convert hydrogen to helium. After its birth, a star continues to be in equilibrium.
What is the key factor that determines the temperature density radius luminosity?
formation and evolution
| Question | Answer |
|---|---|
| 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 is | H2. |
| Protostars are located on the H–R diagram | above and to the right of the main sequence. |
What keeps a star from collapsing?
Stars are fueled by the nuclear fusion of hydrogen to form helium deep in their interiors. The outflow of energy from the central regions of the star provides the pressure necessary to keep the star from collapsing under its own weight, and the energy by which it shines.
What are the outward forces that act on a star What are the inward forces How do these compare?
the outward force that acts on a star is thermal pressure. the inward force that acts on a star is gravity.
What are the two forces that act on a star?
Gravitational forces act to contract the star. Fusion reactions and heat convection act to expand the star. The two forces are balanced and the star remains stable in size and reactions.
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.
