Sentences with phrase «from hydrogen fusion»
The young star is now stable in that the outward pressure from hydrogen fusion balances the inward pull of gravity.
https://science.howstuffworks.com/ Not exact matches
If the amount of matter converted were slightly larger — 0.8 %, fusion would happen so readily and rapidly that no hydrogen would have survived from the Big Bang.
Again, astronomy appears to be a «useless» subject, but has yielded a number of practical results, from the discovery of helium to the theories of the properties of gas plasma currently important in hydrogen fusion projects.
Aliens might want resources from our solar system (Earth's oceans, perhaps, full of hydrogen for refilling a fusion - powered spacecraft) and swat us aside if we get in the way, as we might dismiss mosquitoes or beetles stirred up by the logging of a rain forest.
Nuclear fusion is an important natural process: Many chemical elements originate from hydrogen through fusion; fusion is the energy source of the sun and stars.
These fields will do double duty: They will heat a cloud of hydrogen to the searing temperature required for fusion while forcing the resulting plasma to sit in a ring - shaped cloud away from the tokamak's walls.
There, heat is generated from the fusion of hydrogen nuclei.
As a white dwarf draws off hydrogen - rich material from a binary companion over millions of years, Gilfanov says, it experiences a steady process of nuclear fusion on its surface that gives off tremendous amounts of radiation.
Once nuclear fusion of hydrogen becomes the dominant energy production process and the excess energy gained from gravitational contraction has been lost, [9] the star lies along a curve on the Hertzsprung - Russell diagram (or HR diagram) called the standard main sequence.
Above this mass, in the upper main sequence, the nuclear fusion process can instead use atoms of carbon, nitrogen, and oxygen as intermediaries in the production of helium from hydrogen atoms.
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.
As the star's outer layer begins to swell from the heat of renewed hydrogen fusion before cooling from expanion, this hydrogen - burning zone moves outward, cools, and shuts down while its underlying of helium begins to fuse in turn.
© 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.
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.
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 basic fuel for fusion is deuterium, a form of hydrogen easily separated from ordinary seawater.
The amount of energy available through fusion is extraordinary.Fusion energy is obtained by forcing together atomic nuclei from deuterium and tritium (another form of hydrogen).
... Fusion Power... Generating electricity from fusion rather than fission of atoms has been a dream ever since the first hydrogen bomb was exploded.
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).
Human civilization can flourish for centuries and millennia on energy delivered from a closed uranium or thorium fuel cycle, or from hydrogen - deuterium fusion.
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?»
For fusion, the fuel is two isotopes of hydrogen, deuterium and tritium, the first of which can be extracted from seawater and the second from lithium, whose resources are large and growing.
The outward pressure from fusion counteracts the inward pressure from gravity and an equilibrium point was reached where they are equal and opposite in force and the sun has a relatively stable diameter that will persist until it starts running out of hydrogen fuel to sustain the outward pressure.