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Why do thermonuclear reactions in the Sun take place only in its core?
Wiki User
∙ 13y ago
because that is how gravity works ... And where the atoms of the stars are under the most pressure- At the Centre!
Wiki User
∙ 15y ago
Wiki User
∙ 13y agoBecause only in the core of the Sun is the pressure and temperature high enough to allow hydrogen to fuse.
Wiki User
∙ 11y agoThat's where the temperature is highest and the pressure is greatest, forcing the atomic nuclei together. Cheers! - Marilee
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What happens if our sun's hydrogen gets used up?
Stars are born from clouds of gas and then they enter a stable period of about 5 billion years. Their brightness is due to fusion reactions fuelled by hydrogen. As a star's supply of hydrogen runs out, the high radiation pressure produced by the fusion reactions decreases. Without this outwards pressure, the force of gravity causes the star's core to contract. This increases the temperature of the core, making it hotter than it was during the stable period. The core is now mainly helium. Eventually, the core temperature becomes high enough for further more complex nuclear fusion reactions to occur. The new fusion reactions cause a higher outward radiation pressure than before. At this point the inward gravitational forces are unable to balance the radiation pressure and the star expands. It expands so much that the outer layers cool to about 3000 °C. Because the surface is cooler it looks red (only red-hot, not white-hot), so this type of star called a red giant. When our Sun reaches this stage it will be so large that the Earth will be inside it! :O But this won't happen for at least another 2 million years...
How is energy produced in the suns core?
By thermonuclear fusion of hydrogen, producing helium. The same process that produces the energy in a hydrogen bomb (although the sun fuses far more hydrogen in the same period of time than the largest hydrogen bomb ever speculated would fuse during its entire explosion, thus producing more energy than such a bomb).
What is the only one molten metallic interior Earth shell?
/The Outer Core
Are stars bigger or the moon?
Stars are much much bigger than the moon. They only appear to be smaller because they are so far away as compared to the moon. ------------------------------------------------------------------------------------------------ A star is a gigantic celestial body of hot gas that radiates energy derived from thermonuclear reactions in the interior. The moon appears bigger because it is so much closer to us than the stars. The sun is also considered as a star.
Is the moon solid?
This phenomenon has to do with melting temperature and pressure. The more pressure a substance is under, the higher its melting point becomes. Both the liquid outer core and the solid inner core are made of an iron alloy, which means that chemically their melting points are the same. However, the outer core is under less pressure simply because it is under less material. The outer core supports the weight of the crust and mantle, while the inner core must also bear the weight of the outer core. The additional mass of the outer core creates enough pressure on the inner core to raise the melting temperature of the iron alloy above the temperature at the center of the earth, causing it to solidify. So in short, the inner core is solid because it is under more pressure than the outer core. Hope this helps
What does the core so for the sun?
The core of the Sun is the only part of the Sun (and all stars) that is compressed by gravity enough to maintain runaway thermonuclear reactions to counterbalance the star's own gravity.
Pressure only has an effect on reactions taking place in a?
gas
Are exergoinic and endergoic reactions frequently coupled?
Endergonic reactions are always coupling reactions. They will only occur where there is input of energy and they usually take place in a simultaneous manner.
Why does fusion occur in he sun's core but not in other layers?
Thermonuclear reactions only occur in the core of the star because that's where the heat and pressure is so great that it overcomes the forces between the atoms. The surface stars is relatively cool. The Sun is only around 10,000° F on its surface. well below the several million degrees required for fusion.
Where does nuclear fussion only take place in the sun?
Only at the core where the temperature and pressure is high enough.
Why does fusion take place only in the Sun's core and not in its outer layers?
Because the temperature needed to overcome the repelling nature of the two positively charged nuclei can only be found in the core.
Why is the inner core of the earth the scariest place?
No light only dark and hot. Always on fire.
What is thermonuclear warfare?
Thermonuclear warfare is the use of nuclear weapons in war, either tactically or strategically. Although the term "thermonuclear" technically applies only to the process of fusion, the term is loosely applied to conflict involving fission weapons, fusion weapons, or both (informal synonyms are "atomic war" or "nuclear war").
The place where light reactions occur in a plant?
it occurs in the chloroplast / stroma oh and light reactions can only occur in a plant and some protists because only plants and some protists can perform photosynthesis, and it is in this process which light reactions occur. other cells don't have chloroplast and stromas.
Does a bomb produce gamma rays?
Conventional bombs (dynamite, TNT, etc.) are not powerful enough to produce gamma rays. Gamma rays are only produced in a nuclear bomb or a thermonuclear (hydrogen) bomb where nuclear reactions take place.
When a battery is used up why is its stored chemical energy used up?
Simply put, such a battery depends on a chemical reaction. Reactions can only take place when there is an inbalance between the chemicals. Once a balance is acheived then no more reactions can take place.
What are the uses of catalysts in everyday life?
They help chemical reactions take place where they would either not take place at all or would only take place at much higher energies.
