Sentences with phrase «hydrogen fusion at»

According to James B. Kaler, hydrogen fusion at its helium - rich core may already have died out.

The primary, component A, is a Sun - like star [10] with a stellar classification of F8 V, [5] indicating it is an F - type main - sequence star that is generating energy via hydrogen fusion at its core.

Not exact matches

Image: NIF Scientists with the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory announced today that they have achieved a critical step in fusion research: For the first time, their hydrogen fuel has given off more energy than it took in.

Because all elements in the universe heavier than hydrogen, helium, and lithium have been forged by nuclear fusion in the cores of stars and then scattered into space by supernova explosions, the find indicates that the galaxy, at the age we're now observing it, was old enough for at least one generation of stars to have formed, lived, and died.

Other goals include increased funding for nuclear weapons research; increased research on nanotechnology; space station, moon, and Mars projects at NASA; work on hydrogen fuels; and support for the International Thermonuclear Experimental Reactor (ITER) fusion project.

Newman, who as a teen developed a fascination with turbulence as a rafting guide in Colorado, arrived at Oak Ridge in 1993 to explore a different kind of turbulence: the plasma of fusing hydrogen atoms inside experimental fusion reactors.

Inertial confinement fusion (ICF) seeks to create those conditions by taking a tiny capsule of fusion fuel (typically a mixture of the hydrogen isotopes deuterium and tritium) and crushing it at high speed using some form of «driver,» such as lasers, particle beams, or magnetic pulses.

A star begins to die when the last of the hydrogen fuel at its center succumbs to the star's fusion furnace and the center collapses into a highly compressed, white - hot core.

With masses a hundred times or more that of our sun, they burned hot and fast, forging hydrogen into heavier elements in their fusion furnaces then spewing them out into space when they exploded at the end of their lives.

The prime energy producer in the sun is the fusion of hydrogen to helium, which occurs at a minimum temperature of 3 million kelvin.

On March 23, 1989, B. Stanley Pons, a professor of chemistry at the University of Utah, and his colleague, Martin Fleischmann of the University of Southampton in England, announced they had created fusion — the process that occurs inside the sun and a hydrogen bomb — in a jar of water at room temperature.

Long before descending into scientific infamy, Hoyle made what should have been a lasting contribution with a 1954 Astrophysical Journal paper laying out a process by which stars heavier than 10 suns would burn hydrogen and helium at their cores into heavier elements through a progressively hotter series of nuclear fusion reactions.

Scientists at NIF are seeking to produce fusion by imploding hydrogen fuel capsules with the world's most powerful laser beams in a process called inertial confinement.

The total amount of energy that a star can generate through nuclear fusion of hydrogen is limited by the amount of hydrogen fuel that can be consumed at the core.

After a star has formed, it generates energy at its hot, dense core through the fusion of hydrogen atoms into helium.

Upon reaching a suitable density, energy generation is begun at the core using an exothermic nuclear fusion process that converts hydrogen into helium.

[10] The ZAMS curve can be calculated using computer models of stellar properties at the point when stars begin hydrogen fusion.

According to Professor Jim Kaler at the University of Illinois» Department of Astronomy, Rana started life as a main sequence F8 dwarf (somewhat hotter and brighter than Sol with slightly greater mass) around 7.5 billion years ago, but core hydrogen fusion has ceased causing the star to expand and cool as an active subgiant before becoming much brighter and larger «as a true giant star» through core helium fusion.

As a star that has evolved out of the «main sequence,» Gacrux has shifted fully from the fusion of hydrogen to helium at its core to the fusion of helium to carbon and oxygen, with trace activity of other nuclear processes.

© American Scientist (Artwork by Linda Huff for Martin et al, 1997; used with permission) Although brown dwarfs lack sufficient mass (at least 75 Jupiters) to ignite core hydrogen fusion, the smallest true stars (red dwarfs) can have such cool atmospheric temperatures (below 4,000 ° K) that it is difficult to distinguish them from brown dwarfs.

It rotates more slowly than Sol with a period at 34 days (Baliunas et al, 1996) and appears to be further along in core hydrogen - fusion, with a relatively weak 11 - year cycle of star spots and related chromospheric activity.

Another sign of progress on the road to fusion energy was the Feb. 3 celebration of the first hydrogen plasma at the Wendelstein 7 - X stellarator in Greifswald, Germany, Synakowski said.

As a star that has evolved out of the «main sequence,» Arcturus has fully shifted from the fusion of hydrogen to helium in at its core to the fusion of helium to carbon and oxygen, with trace activity of other nuclear processes.

Through the process of fusion, which is constantly occurring in the sun and other stars, energy is created when the nuclei of two lightweight atoms, such as those of hydrogen, combine in plasma at very high temperatures.

As a star that has evolved out of the «main sequence,» Pollux has fully shifted from the fusion of hydrogen to helium at its core to the fusion of helium to carbon and oxygen, with trace activity of other nuclear processes.

The temperature at its core has been estimated about 15,000,000 K. Energy is produced in its core by nuclear fusion, converts hydrogen atoms and releases huge amounts of energy.

At the center of the Sun, where its density reaches up to 150,000 kg / m3 (150 times the density of water on Earth), thermonuclear reactions (nuclear fusion) convert hydrogen into helium, releasing the energy that keeps the Sun in a state of equilibrium.

Some 99.5 % of the hurricane force cause no harm and is naturally dissipated — every second, some 2 million metric tons of air are circulated in, up, and out of the hurricane — where heat energy is radiated to empty space — which every day equals, the energy released by the fusion of four hundred 20 mega-ton hydrogen bombs (See, Rice University's Hurricane Trivia at Houston TeacherTECH Archives).

There are various types of technologies that can play significant roles in mitigating climate change, including energy efficiency improvements throughout the energy system (especially at the end use side); solar, wind, nuclear fission and fusion and geothermal, biomass and clean fossil technologies, including carbon capture and storage; energy from waste; hydrogen production from non-fossil energy sources and fuel cells (Pacala and Socolow, 2004; IEA, 2006b).

If the Sun were a massive ball of hydrogen, heated by a H - fusion reactor at its core, then changes at the solar core would be delayed by about 30 My (million years), the diffusion time for radiation from the core of the Sun to its surface [See William A. Fowler, «What cooks with solar neutrinos?»

BBM (Big Bang Model) of hydrogen creation at the birth of the universe, SSM (Standard Solar Model) of hydrogen - filled stars heated by H - fusion, AGW / AGC Models of Anthropologic Global Warming and / or Cooling, Models of neutron stars as dead nuclear embers of burned - out stars, and The BHM (Black Hole Model) for storing imaginary stellar end products.