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physical object > natural object > particle > elementary particle > hadron > baryon > hyperon

hyperon comparison table

Subject	is an instance of	has definition	has value
delta	hyperon	Short-lived baryon.
lambda	hyperon	Heavy short-lived baryon.
omega	astronomical constant	The ratio of the average density of mass in the universe to the critical mass density, the latter being the density of mass needed to eventually halt the outward expansion of the universe. In an open universe, omega is always less than 1; in a closed universe, it is always greater than 1; in a flat universe it is always exactly equal to 1. Unless omega is exactly equal to 1, it changes in time, constantly decreasing in an open universe and constantly increasing in a closed universe. Omega has been measured to be about 0.1, although such measurements are difficult and uncertain. (See critical mass density; closed universe; flat universe; open universe.)
sigma	hyperon	Short-lived baryon.

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