has fusion been achieved on earth?
316349
Fusion is not only possible on earth, it has been carried out many times. ... The reaction took place, but the amount of energy needed was more than was generated by the fusion; the “gain” was about 0.7, while 1.0 means balance and more than 1 is needed for net energy output.
412580
For example, hydrogen and hydrogen can fuse to form helium. Fission occurs naturally on Earth. An example is the spontaneous fission of uranium, which only happens if enough uranium is present in a small enough volume (rarely). Fusion, on the other hand, does not occur naturally on Earth.
758724
Fission is used in nuclear power reactors since it can be controlled, while fusion is not utilized to produce power since the reaction is not easily controlled and is expensive to create the needed conditions for a fusion reaction.
748808
Like a great many things in comic books, theoretically, it is very much possible. As it stands, our current understanding of the natural world places no implicit limitations on any of the attributes of the Iron Man armor. The Physics of every aspect of that suit is in fact very plausible, and downright realistic.
340928
There is currently no accepted theoretical model that would allow cold fusion to occur. In 1989, two electrochemists, Martin Fleischmann and Stanley Pons, reported that their apparatus had produced anomalous heat ("excess heat") of a magnitude they asserted would defy explanation except in terms of nuclear processes.
815628
Very low temperatures Absolute zero cannot be achieved, although it is possible to reach temperatures close to it through the use of cryocoolers, dilution refrigerators, and nuclear adiabatic demagnetization. The use of laser cooling has produced temperatures less than a billionth of a kelvin.
401877
An important fusion reaction for practical energy generation is that between deuterium and tritium (the D-T fusion reaction). It produces helium (He) and a neutron (n) and is written D + T → He + n. To the left of the arrow (before the reaction) there are two protons and three neutrons.
1040122
The technology required to travel between galaxies is far beyond humanity's present capabilities, and currently only the subject of speculation, hypothesis, and science fiction. However, theoretically speaking, there is nothing to conclusively indicate that intergalactic travel is impossible.
1213755
When hydrogen atoms fuse, the nuclei must come together. ... High temperature - The high temperature gives the hydrogen atoms enough energy to overcome the electrical repulsion between the protons. Fusion requires temperatures about 100 million Kelvin (approximately six times hotter than the sun's core).
852355
Nuclear fusion can produce energy when the nuclei of lighter elements come together (fuse), creating larger nuclei. ... Cold fusion is an attempt to get fusion to occur under less extreme conditions, possibly as a result of chemical reactions.
99089
If its mass is great enough for fusion to occur, it's a star. So the biggest difference between a star and a planet is that a sun is massive enough for fusion.
1109004
About five percent of hydrogen gas produced worldwide is created by electrolysis. Currently, most industrial methods produce hydrogen from natural gas instead, in the steam reforming process.
179363
At present, the Earth receives about 1,500 Watts of power per square meter from the Sun. In order to obtain enough power to migrate the Earth in the right amount of time, we'd need to build an array (in space) that collected that entire 4.7 × 1035 Joules of energy, evenly, over a time period of two billion years.
313727
The Earth's atmosphere is thick enough that virtually no X-rays are able to penetrate from outer space all the way to the Earth's surface. This is good for us but also bad for astronomy - we have to put X-ray telescopes and detectors on satellites! We cannot do X-ray astronomy from the ground.
512391
Fusion takes place when two low-mass isotopes, typically isotopes of hydrogen, unite under conditions of extreme pressure and temperature. Fusion is what powers the sun. ... Both fission and fusion are nuclear reactions that produce energy, but the applications are not the same.
1029727
Fusion power is a proposed form of power generation that would generate electricity by using heat from nuclear fusion reactions. In a fusion process, two lighter atomic nuclei combine to form a heavier nucleus, while releasing energy. Devices designed to harness this energy are known as fusion reactors.
53818
['Two protons within the Sun fuse. ... ', 'A third proton collides with the formed deuterium. ... ', 'Two helium-3 nuclei collide, creating a helium-4 nucleus plus two extra protons that escape as two hydrogen.']