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theoretical celestial body comparison table

Subject	has validity	has definition	has author	has domain	has date	is a kind of
cosmic string	correct or incorrect with caveats	Some contemporary cosmological theories suggest that boundaries were formed between different regions of the universe at the moment of creation. These boundaries survive today as "cosmic strings", incredibly thin but very massive strings many light years in length.	or reasearch group	cosmology	or a range of dates for which the theory was active	cosmology theory
singularity		If the standard big bang theory is extrapolated all the way back to time zero, one reaches an instant of infinite density, infinite pressure, and infinite temperature - an instant that is frequently called the initial singularity. This singularity is sometimes said to mark the beginning of time, but it is more realistic to recognize that an extrapolation to infinite density cannot be trusted.				theoretical celestial body

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