The inverse square law of gravitation,which states that two bodies attract one another with a force whose strength is directly proportional to the product of their masses and inversely proportional to the square of their distance, is constrained within boundaries set by general relativity for a specific average density of matter so that gravity causes the curvature of space-time as the universe of matter constantly expands. This is a theory which fitted the universe of known facts in the time of the theorist, as does the theory of relativity in our own time. Since relativity is not absolute it is therefore not true but is merely a step on the way to a human understanding of truth
" Serious mind, serious life" 