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What happens to the surface temperature and luminosity when gravity first assembles a protostar from a collapsing cloud?
Wiki User
∙ 12y ago
Its surface temperature and luminosity increase.
Wiki User
∙ 12y ago
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In which part of a newborn star does the fusion reactio occur?
In the center where the pressure and temperature are highest
When does equilibrium occur in a protostar?
well to my calculations the equilibrium occurs when the gas and the dust form a giant triangle and blow up into a super nova
How does a contracting protostar convert gravitational energy into thermal energy?
Sliding friction tends to convert kinetic energy into thermal energy, thermal energy being heat, kinetic energy being movement.
What causes a 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. As the collapse continues, the temperature increases. The collapsing cloud separates into many smaller clouds, each of which may eventually become a star. The core of the cloud collapses faster than the outer parts, and the cloud begins to rotate faster and faster to conserve angular momentum. When the core reaches a temperature of about 2,000 degrees Kelvin, the molecules of hydrogen gas break apart into hydrogen atoms. Eventually the core reaches a temperature of 10,000 degrees Kelvin, and it begins to look like a star when fusion reactions begin. When it has collapsed to about 30 times the size of our sun, it becomes a protostar. When the pressure and temperature in the core become great enough to sustain nuclear fusion, the outward pressure acts against the gravitational force. At this stage the core is about the size of our sun. The remaining dust envelope surrounding the star heats up and glows brightly in the infrared part of the spectrum. At this point the visible light from the new star cannot penetrate the envelope. Eventually, radiation pressure from the star blows away the envelope and the new star begins its evolution. The properties and lifetime of the new star depend on the amount of gas that remains trapped. A star like our sun has a lifetime of about 10 billion years and is just middle-aged, with another five billion years or so left. " source: http://www.sciam.com/article.cfm?id=how-is-a-star-born
What is the process that produce energy in stars?
Due to gravity the clouds will start to shrink. In the core density and temperature will become high enough so that nuclear fusion can start. The gas cloud becomes a stable star. This is the present state of our Sun. Around the Sun a disk of gas and dust is left, containing about 1% of the mass of the Sun. In the inner part of the disk it is warm enough so that molecules like water, ammonia and methane tend to stay as gases and not produce grains and clumps and so on. And because they stay in gas form the radiation pressure from the Sun and the solar wind will push them outwards. Around the orbit of Jupiter it becomes cold enough for ice to form. The gaseous molecules can produce grains and lumps so there's a lot of this less dense material around to accrete into planets. Jupiter and Saturn grew large enough to pull in great quantities of hydrogen and helium from the solar nebula. The inner planets accreted from grains containing heavier atoms like oxygen and aluminium and silicon as well as iron and nickel and so on. Consequently inside the ice limit at 5 AU only small, dense planets have formed, while outside there is matter enough to form the gas giants. At this stage we have a dozen of proto-planets and quite a lot of comet-like, icy, small stuff. The proto-planets swept space clean with their gravitation fields and the comets rained on them. This also helped in making their orbits more circular. But it was still a period with big collisions. For instance there are clear indications that the Moon was formed after a collision of the proto-Earth with another big object. Nowadays, what is left over are zones like the asteroid belt, where Jupiter's perturbing gravity inhibited the formation of another planet. And also the Oort cloud, the region outside the orbit of Neptune, where dwarf planets like Pluto and Eris make their long orbits
Why doesnt a protostar form a black hole?
The pressure within a protostar counters gravity and prevents the star from collapsing further.
What is it called when the nebula begins collapsing and turning into a small spinning cloud?
Protostar
Why does the temperature of a protostar increase?
As gravity pulls more material toward the center of the protostar, the pressure inside the protostar builds.
When does a newly forming star have the greatest luminosity?
A rotating nebula (a cloud of gas and dust) collapses under gravity. This creates a lot of heat energy. A "protostar" forms, before nuclear fusion begins. When the core temperature is high enough, hydrogen nuclei can undergo fusion and become helium, releasing nuclear energy. So, eventually the protostar becomes a "true" star and reaches the Main Sequence on the HR diagram. The newly forming star has its greatest luminosity during the earlyprotostar stage. (The protostar has a much bigger surface area than the final star.)
What is the temperature of a protostar?
the color of the protostar is red
Why does temperature increase more rapidly in a more massive protostar than in a less masive protostar?
because the jews said so
How are temperature and density affected when a protostar begins to collapse?
Both will increase.
What size is a protostar?
Protostars can be a mix of colors usually orange, red ,purple , blue, and yellow.
Inside a prostar the nuclear fusion of hydrogen will begin when?
The core of the protostar reached an extremely high temperature
The earliest stage of a stars life is called a?
A Protostar.
How is a protostar different from a star?
A star begins its life as a ball of gas and dust. Gravity pulls the gas and dust into a spere. As the sphere becomes denser, it gets hotter and eventually reaches temperature of about 10,000,000 Celsius in its center. As hydrogen combines into helium, energy is released in a precess called neclear fusion.
How long does a protostar live?
A protostar will live as long as 100,000 years. After material stops falling on the protostar it will enter then T Tauri star phase.
