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...uranium-238]] with neutrons in a [[nuclear reactor]], then recovered via [[nuclear reprocessing]] of the fuel. Further [[neutron capture]] produces successive ...9%) and [[reactor grade]] (> 19%). Lower grades are less suited for [[nuclear weapon]]s and [[thermal reactor]]s but can fuel [[fast reactor]]s. Pu-240 i ...

...able nuclei that can undergo [[radioactive decay]]. This can result in a [[Nuclear transmutation|transmutation]] that changes the number of protons or neutron ...[[Otto Frisch]] verified that Hahn's result were the first experimental ''nuclear fission''.<ref> ...

...ht be found in the solar system—perhaps in the [[asteroid belt]] where raw materials would be plentiful and easily accessed.<ref>{{cite journal |author=Papagian ...ight technology. Possible means of annihilation include [[Nuclear warfare|nuclear war]], [[biological warfare]] or accidental contamination, [[grey goo|nanot ...

...'Galileo'']] spacecraft and from the ground has revealed various non-water materials: [[carbon dioxide]], [[sulfur dioxide]] and, possibly, [[cyanogen]], [[hydr ...etings/lpsc2007/pdf/1098.pdf|format=pdf}}</ref> contains clays and organic materials that could indicate the composition of the impactors from which Jovian sate ...

...e visible.<ref name=Motte1998/> Around this time the protostar begins to [[nuclear fusion|fuse]] [[deuterium]] and then ordinary hydrogen.<ref name=Stahler198 ...the disk becomes thinner and cools.<ref name=Hartmann1998/> Less volatile materials start to [[condensation|condense]] close to its center, forming 0.1&ndash;1 ...

..., forming most of the terrestrial planets and [[asteroid]]s. ''Gases'' are materials with extremely low melting points and high [[vapor pressure]] such as [[mol ...09-05-14}}</ref> gives it an interior [[density]] high enough to sustain [[nuclear fusion]], which releases enormous amounts of [[energy]], mostly [[radiant e ...

...of relativity]] led to his realisation that the Sun's energy comes from [[nuclear fusion]] reactions in its core.<ref>{{cite book | title=The Sun: A Biograph ...craft)|Stardust]]'' sample return from [[Comet Wild 2]] has suggested that materials from the early formation of the Solar System migrated from the warmer inner ...

...10 million years, its internal energy generation was derived entirely from nuclear reactions. The core became [[convection zone|convective]] and utilized the ...="apj_630"/> This is overlaid by an envelope of lighter elements, with the materials segregated by mass because of the high surface gravity.<ref>{{cite journal ...

...e [[brain]],<ref>{{cite journal |author=Kriaucionis S, Heintz N |title=The nuclear DNA base 5-hydroxymethylcytosine is present in Purkinje neurons and the bra ...f>{{cite journal |author=Cremer T, Cremer C |title=Chromosome territories, nuclear architecture and gene regulation in mammalian cells | journal=Nat Rev Genet ...

| title=Our Changing Sun: The Role of Solar Nuclear Evolution and Magnetic Activity on Earth's Atmosphere and Climate ...lten outer core region where heat creates convection motions of conducting materials, generating electric currents. These in turn produce the Earth's magnetic f ...