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Comment: Latex, 12 pages
Comment: typos corrected, new reference, minor text modifications
Comment: 10 pages, Corrected typos, Changed example
Comment: 17 pages
Comment: 8 pages
Comment: 6 pages
Comment: In Proceedings of ERE93, Edited version, 9 pages
Comment: 11 pages, minor changes, an error in an intermediate step of the derivation of (40) has been corrected
Comment: 9 pages
To make sense of a global space-time model and to give a meaning to the coordinates that we use, a choice of a constant curvature space-metric of reference it is as much necessary as it is a choice of units of mass, length and time. The choice we make leads to contradict the belief that the exterior domain of a Static Spherically Symmetric (SSS) space-time model of finite radius $R$ depends only on the active mass $M_a$ of the source. In fact it depends on two parameters $M_a$ and a new one $Q$. We prove that both can be calculated as volume integrals extended over the whole space. We integrate Einstein's equations numerically in two simple cases: assuming either that the source of perfect fluid has constant proper density or that the pressure depends linearly on the proper density. We confirm a preceding paper showing that very co...
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