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Minimum total potential energy principle
[[File:Irrotational vortex.gif|thumb|The self-gravitational involution of a 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''&nbsp;=&nbsp;[[w:Planck constant|''h'']][[w:frequency(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. "'''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. Th(contracted; show full)—<span class="plainlinks">[https://en.wikiquote.org/w/index.php?title=Terence_McKenna&oldid=2251202 Terence McKenna]]]

==References==
{{reflist}}

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