0
What else can I help you with?
In stars hydrogen nuclei combine with each other to form helium and other heavier elements. What is this process called?
This process is called "nuclear fusion".
What is the sequence of events leading up to the white dwarf stage?
Here is an answer based on a typical star like our Sun. It's slightly simplified. If you need more detail Wikipedia's "Stellar Evolution" is useful, but a bit complicated. An easier introduction is given by NASA in the "Sources and related links" below. Just click on that link if you wish. All stars will eventually exhaust their supply of hydrogen, the main fuel of every star in the universe (and most abundant element in the universe). The main process of fusion that powers all stars converts hydrogen into the heavier element helium (see "fusion" for more details). For a star with the mass of our Sun, each second millions of tons of hydrogen (600 million) are converted to helium, slowly depleting the remaining hydrogen (our Sun started with about 11-13 billion years of hydrogen "fuel"). When the hydrogen supply runs low, the Sun will expand, reaching the "red giant" stage of its life. Eventually the core will become hot enough to fuse helium. The process of fusion will then continue with the helium, along with some remaining hydrogen. The helium will be converted to carbon, continuing to power the star. A quite complicated situation arises with hydrogen and helium "burning" at different levels in the star. Fusion stops after producing oxygen nuclei, because the Sun's temperatures will not be high enough to produce heavier elements. As the last fuel is exhausted, the star's outer layers will be expelled by the imbalance in pressure from fusion versus the gravity holding the star together. As these outer layers are expelled, the core of carbon and oxygen nuclei will be the remnant, a white dwarf star. In the beginning there will be a super hot white dwarf emitting light until it cools down and no longer emits light and becomes a black dwarf. High mass stars, after going supernova, become neutron stars or become black holes, if they're massive enough.
What is the conversion of hydrogen to helium in the enterior of a star called?
The process is called "nuclear fusion". When temperature and pressure are high enough, the nuclei (nucleusses) of two hydrogen atoms may be forced together so hard that they join and form a single nucleus. Each hydrogen nucleus consists of one proton, so when they join, their combination consists of two protons, and that's one form of the nucleus of a helium atom. The thing that makes it more interesting is that the mass of the new nucleus is less than the sum of the two that got squashed together to make it, and we have to ask what happened to the missing mass. The answer is that it became energy, and radiated away from the spot where the two nuclei were joining. That's the process responsible for the energy that radiates from the sun, and from most stars during most of their life. Scientists and engineers have developed the technology to be able to create nuclear fusion here on Earth, although it's still somewhat messy. You'd think that this is a pretty good way to generate energy for our use, and you're absolutely right. The problem is that when fusion is going on and energy is coming out, it's so hot that nothing has been developed yet to keep it in. So right now, there's only one device that regularly uses nuclear fusion here on Earth. We call that device the "hydrogen bomb".
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 element is in a black hole?
It is not expected that elements would survive as such, within a black hole. Gravitational force would crush everything together to the point where no atomic nuclei remain intact.
What element is formed when hydrogen nuclei fuse together?
When hydrogen nuclei fuse together, they can form helium. This fusion process is the energy source for stars, including our sun, where hydrogen nuclei combine to form helium through a series of nuclear reactions.
What gas is produced by nuclear fusion?
In the most common stellar fusion, helium gas is formed from the fusion of hydrogen nuclei.
This type of nucleus is formed during a solar nuclear reaction by the fusion of four nuclei.?
A helium nucleus, also known as an alpha particle, is formed during a solar nuclear reaction by the fusion of four hydrogen nuclei.
What element is transformed in solar fusion?
Our sun mostly transforms hydrogen nuclei into helium by fusion, but it also fuses helium with helium, lithium with hydrogen, and beryllium with hydrogen, to make elements as heavy as boron.
What fusion in stars occurs to create the element helium?
Hydrogen fusion occurs in stars to create helium. This process, known as nuclear fusion, involves the fusion of hydrogen nuclei to form helium nuclei, releasing large amounts of energy in the process.
What are the particles for the nuclear fusion in stars?
A variety of different fusion reactions are possible. In our sun, which is classified as medium sized, it is fusion of hydrogen nuclei, ie protons, to form helium. In larger stars, especially red giants, larger nuclei react in fusion, so that larger and heavier nuclei get formed.
What does the fusion of hydrogen nuclei in sun produce?
The fusion of hydrogen nuclei in the sun produces helium, along with energy in the form of light and heat. This process is known as nuclear fusion and is the source of the sun's energy.
Which pair of nuclei can undergo a fusion reaction?
Hydrogen-2 (deuterium) and hydrogen-3 (tritium) nuclei can undergo fusion to form helium-4, releasing a neutron in the process. This fusion reaction is the basis for fusion energy production in potential future reactor designs.
When two hydrogen nuclei combine to form one helium nucleus nuclear fusion has taken place.?
Yes, this is nuclear fusion.
What does nuclear fusion create inside of stars?
Inside the sun, nuclear fusion creates helium nuclei from...a. oxygen nuclei. b. beryllium nuclei.c. carbon nuclei.d. hydrogen nuclei.The answer is d. hydrogen nuclei.
Is Fusion a process in which existing nuclei combine to make new nuclei?
Yes. In nuclear fusion, experiments are trying to produce fusion of nuclei of deuterium and tritium, which are isotopes of hydrogen. The product will be nuclei of helium plus released energy.
Which substance is most likely to undergo nuclear fusion?
Hydrogen is the most likely substance to undergo nuclear fusion. In the core of stars, hydrogen nuclei combine to form helium through the fusion process, releasing vast amounts of energy in the form of heat and light.
