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These regions are extremely cold temperature about 10 to 20K, just above absolute zero. At these temperatures, gases become molecular meaning srar atoms bind together. CO and H2 are the most common molecules in interstellar gas clouds.

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Fusion in Stars Swirls of hydrogen and helium gas condensed into huge clouds. The gravitational force at the core brought the matter closer and closer together witj some of the nuclei coalesced. This produced energy, the heat and light of the stars. What is Fusion? Fusion a type of nuclear reaction where two nuclei come together to form the nucleus of a different element.

Each element has a particular of protons in the nucleus. Isotopes of an element all have the same of protons but different s of neutrons. In the core of a star, gravity produces high density and high temperature. At this temperature, the hydrogen and helium gases become a plasma.

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That beglnning, the electrons separate from the nuclei to give a mix of positively charged ions and electrons. Under these conditions protons H-1 react with other protons to make deuterium nuclei H-2 and positrons. The deuterium nuclei can merge to form a helium nuclei He-4or they can interact with other protons to make another isotope of helium He Two He-3 nuclei can fuse to woth a nucleus of an unstable beryllium nucleus Be-6 that breaks apart to give He-4 and two protons.

Energy is released at each step.

The fusion of hydrogen nuclei uses up hydrogen to produce helium and energy. These regions are extremely cold temperature about 10 to 20K, just above absolute zero.

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At these temperatures, gases become molecular meaning that atoms bind together. CO and H2 are the most common molecules in interstellar gas clouds. The deep cold also causes the gas to clump to high densities. When the density reaches a certain point, stars form.

Since the regions are dense, they are opaque to visible light and are known as dark nebula. Since they don't shine by optical light, we must use IR and radio telescopes to investigate them. These cores typically have masses around solar masses in the form of gas and dust.

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The cores are denser than the outer cloud, so they collapse first. As the cores collapse they fragment into clumps around 0.

Stag clumps then form into protostars and the whole process takes about 10 millions years. How do we know this is happening if it takes so long and is hidden from view in dark clouds? Most of these cloud cores have IR sources, evidence of energy from collapsing protostars potential energy converted to kinetic energy.

Also, where we do find young stars see below we find them surrounded by clouds of gas, the leftover dark molecular cloud. And they occur in clusters, groups of stars that dtar from the same cloud core.

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. The infalling gas releases wity energy in the form of heat and the temperature and pressure in the center of the protostar goes up. As its temperature approaches thousands of degrees, it becomes a IR source.

During the initial collapse, the clump is transparent to radiation and the collapse proceeds fairly quickly. As the clump becomes more dense, it becomes opaque. Escaping IR radiation is trapped, and the temperature and pressure in the center begin to increase. At some point, the pressure stops the infall of more gas into the core and the object becomes stable as a protostar. But the envelope of the star continues to begininng as infalling material is accreted.

After a few million years, thermonuclear fusion begins in its core, then a strong stellar wind is produced which stops the infall of new mass. The protostar is now considered a young star since its mass is fixed, and its future evolution is now set.

T-Tauri Stars: Once a protostar has become a hydrogen-burning star, a strong stellar wind forms, begunning along the axis of rotation. Looking for baby names starting with H? Take a look at our alphabetical list and find girls names and boys names beginning with H. All actors beginning 'H' and their age in movies.

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Browse the full list of Star Wars · The Empire Strikes Back · Return of the Jedi · Blade Runner · Raiders of the. London Record Society, 'Surnames beginning 'H'', in London Inhabitants Within the Walls (London, ), pp. British History Online. ❶Initially, the temperature in the core is not hot enough to ignite helium burning.

However, the core cannot expand as much as required to compensate for the increased energy generation caused by the helium burning. After a few million years, thermonuclear fusion begins in its core, then a strong stellar wind is produced which stops the infall of new mass. How wity we know this is happening if it takes so long and is hidden from view in dark clouds?

With this understanding of how the Sun will evolve, we can follow its evolution on the HR diagram. The total mass of the helium nucleus is less than the sum of the mass beglnning the 4 particles that make it up.

Later the cluster breaks out, the gas is blown away, and the stars evolve as shown below. Contraction is halted when the electrons become degenerate, that is when they can no longer be compressed further. With the additional energy generation brginning the H-burning shell, the outer layers of the star expand but their temperature decreases as they get further away from the center of energy generation. At this point, helium burning ignites, as helium is converted into carbon C and oxygen O.

These hypothesized bodies were called black stars or infrared stars before the name "brown dwarf" was suggested in Neither planets nor stars, brown dwarfs share properties with both kinds of objects: They are formed in molecular clouds much as stars are, but their atmospheres are reminiscent of the giant gaseous planets.

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This early phase in the life of a star is called the T-Tauri phase.|Developed independently in the early s by Ejnar Hertzsprung and Henry Norris Russell, it plots the temperature of stars against their luminosity the theoretical HR diagramor the colour of stars or spectral type against their absolute magnitude the observational HR diagram, also known as a colour-magnitude diagram.

Depending on its initial massevery star goes through specific evolutionary stages dictated by its internal structure and how it produces energy. Each of these stages corresponds to a change in the temperature and luminosity of the star, which can be seen to move to different regions on the HR diagram as it evolves.

The Hertzsprung-Russell diagram the various stages of stellar evolution. By far the most prominent feature is the main sequence greywhich runs from the upper left hot, luminous stars to the wtih right cool, faint stars of the diagram.

Surnames beginning 'H' | British History Online

The giant branch and supergiant stars lie above wth main sequence, and white dwarfs are found below it. Credit : R. This Hertzsprung-Russell diagram shows a group of stars in various stages of their evolution. By far the most prominent feature staf the main sequence, which runs from the upper left hot, sttar stars to the bottom right cool, faint stars of the diagram.

The giant branch is also well populated and there are many white dwarfs.

Also plotted are the Morgan-Keenan luminosity classes that distinguish between stars of the same temperature but different luminosity.]

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