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Relativistic cosmologies are offshoot of Einstein's [[General theory of relativity|theory of general relativity]]. From there, several contributing principles are adopted:

Relativistic cosmologies are offshoot of Einstein's [[General theory of relativity|theory of general relativity]]. From there, several contributing principles are adopted:

*The basic proposition that the geometry of space is determined by the content of space (Einstein's [[gravitational field equations]] invented to describe the structure of the cosmos).

*The basic proposition that the geometry of space is determined by the content of space (Einstein's [[gravitational field equations]] invented to describe the structure of the cosmos).

*A sheer assumption that all observers, regardless of their location, should see the same general picture of the universe ([[Cosmological principle]]). This second principle seems plausible to relativistic cosmologists as it appeals strongly to their so called ''sense of proportion'' and helps them to avoid the [[horror of a unique position]].     

*A sheer assumption that all observers, regardless of their location, should see the same general picture of the universe ([[Cosmological principle]]). This second principle seems plausible to relativistic cosmologists as it appeals strongly to their so-called ''sense of proportion'' and helps them to avoid the [[horror of a unique position]].     

*Another important aspect of such cosmologies is highly abstract concept of [[spatial curvature]] allowing relativistic theorists to make assumption of homogeneity thus to adopt [[Riemannian geometry]] which operates in curved space.  

*Another important aspect of such cosmologies is highly abstract concept of [[spatial curvature]] allowing relativistic theorists to make assumption of homogeneity thus to adopt [[Riemannian geometry]] which operates in curved space.