Difference between revisions 5703220 and 5703222 on simplewiki

[[File:Irrotational vortex.gif|thumb|[[Potential energy]] is [[rest mass]].<ref name="RestMass"/> The self-gravitational involution of a rest mass can be visualized as a series of concentric shells. The higher a shell, the lower its rotational frequency. If we sufficiently extend the series of concentric shells, then the outermost shell's rotational frequency will be zero, so that the shell will have the lowest (''i.e.'', zero) actual energy (''E''(contracted; show full)
:—Murdin, P. (ed.) ♦ Encyclopaedia of Astronomy and Astrophysics ♦ Nature Publishing Group and Institute of Physics Publishing, 2001
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All potential energy ([[rest mass]]<ref name="RestMass"/>) is gravitational; other types of potential energy are temporary masks of gravity.<ref>[[w:Frank Shu|Shu, Frank H.]] [https://books.google.co.uk/books?id=v_6PbAfapSAC&pg=PA157 The Physical Universe: An Introduction to Astronomy]. University Science Books, 1982, p. 157.
<br> "'''Concluding Philosophical Comment.'''<br>Zeldovich and Novikov have made the following intriguing philosophical point about the picture of the formation of a neutron star sketched here. They note that stars begin their lives as a mixture mostly of hydrogen nuclei and their stripped electrons. During a massive star's luminous phase, the protons are combined by a variety of complicated reactions into heavier and heavier elements. The nuclear binding energy rel(contracted; show full)*[[Heat death of the universe]]

==References==
{{reflist}}

[[Category:Basic physics ideas]]
[[Category:Cosmology]]
[[Category:Energy]]