What happens when an interstellar cloud fragment contracts? Its pressure increases.
What happens when an interstellar cloud fragment shrinks? It first becomes opaque; Density rises; Temperature rises; Pressure rises.
As an interstellar cloud contracts, gravitational instabilities cause it to fragment into smaller pieces.
As the cloud collapses, a dense, hot core forms and begins gathering dust and gas. Not all of this material ends up as part of a star — the remaining dust can become planets, asteroids, or comets or may remain as dust. In some cases, the cloud may not collapse at a steady pace.
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.
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.
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.
rotation is able to counteract the inward pull caused by gravity, which causes material, including gas, to fly off into space.
CardsTerm What does star formation generally occur from?Definition the cores of giant molecular cloudsTerm What are the four factors that resist the collapse of a cloud?Definition 1. thermal energy (pressure) 2. magnetic fields 3. rotation 4. turbulanceTerm What is another word for rotation?Definition angular momentum57 more rows•Apr 1, 2009
Stars form from an accumulation of gas and dust, which collapses due to gravity and starts to form stars. 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.
Which of the following is most important in causing a cloud of gas to collapse to form a star and planets? Gravity pulls all the gas inward.
Protostars: Once a clump has broken free from the other parts of the cloud core, it has its own unique gravity and identity and we call it a protostar. As the protostar forms, loose gas falls into its center.
A nebula is a giant cloud of dust and gas in space. Some nebulae (more than one nebula) come from the gas and dust thrown out by the explosion of a dying star, such as a supernova.
What effect do even thin clouds of dust have on light passing through them? It dims and reddens the light of all more distant stars. Hydrogen is the major gas in the interstellar medium.
What would happen if mass is added to a 1.4 solar mass white dwarf? The star would eventually become a black hole.
Why did the solar nebula flatten into a disk? The force of gravity from the planets pulled the material downward into a flat disk. It flattened as a natural consequence of collisions between particles in the spinning nebula, changing random motions into more orderly ones.
the interstellar cloud from which our sun formed was. thousands of times more massive than the sun. briefly describe the basic chain of events leading to the formation of a star like the sun. stage1: interstellar cloud starts to contract, (probably triggered by shock/pressure wave from nearby star); as it contracts the cloud fragments ...
the following figures show four stages that occur during the formation of a one-solar-mass star. rank these stages based on their rotation rate, from fastest to slowest.
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.
rotation disrupts the process of star formation by opposing the force of gravity. rotation is able to counteract the inward pull caused by gravity, which causes material, including gas, to fly off into space. with faster rotation, more gas is lost/escapes, causing a greater gravitational force trying to retain these gases.
stage5: the protostar's luminosity decreases even as its temperature rises, b/c its becoming more compact.
the role of heat: a star needs a very high core temperature in order to create the pressure needed to balance out the gravitational and pressure pulls. once this balance is created, it is possible to undergo nuclear fusion which creates the star and keeps it balanced during it's lifetime.
provided following are four different ranges of stellar masses. rank the stellar mass ranges based on how many stars in each range you would expect to be born in a star cluster, from highest number to lowest number.
The interstellar cloud starts to contract, probably triggered by a shock or pressure wave from a nearby star.
A cloud fragment too small to form a star becomes: A brown dwarf. (A fragment of a collapsing gas cloud that comes to equilibrium with a central temperature of 4 million K will become a brown dwarf as well; it is less than 10 million K.) A cloud fragment too small to collapse into a main sequence star becomes a:
A brown dwarf. (A fragment of a collapsing gas cloud that comes to equilibrium with a central temperature of 4 million K will become a brown dwarf as well; it is less than 10 million K.)
Bipolar flows are characterized by strong heating within protostellar disc which produces two "jets" of matter.
Failed stars formed from a cloud fragment that was not massive enough to achieve central temperatures high enough to ignite nuclear fusion in the object's core.
a dark dust cloud collapses under its own weight and heats up until nuclear fusion begins.
By stage 3, the star has formed a photosphere. (This is NOT true; photosphere is formed in Stage 4.)