Example: ... positive curvature (a ball): parallel lines eventually meet; ... (=Rr in a flat universe). But the change in the true distance is completely described by the change in the expansion factor R(t). Tracing back in the time, there were several school of thoughts regarding the origin of the universe. To measure the Universe’s curvature today the astronomers use the theory of relativity. If the energy at every point in the universe is positive, how could it possibly be true that the total adds to zero? The universe (Latin: universus) is all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy.While the spatial size of the entire universe is unknown, it is possible to measure the size of the observable universe, which is currently estimated to be 93 billion light-years in diameter. In section 3, we provide an example model that realizes the sequence of expansion, contraction, and expansion, and also show our numerical results. In section 2, we explain our solution of the bouncing universe based on the positive curvature and the flat potential. The main problem is to measure the content of the Universe. and 2) from spacetime, stored in the gravitational fields. Well, the ``simple layperson'' explanation is that in cosmology, there's contributions to the energy both from 1) matter (baryons, dark matter, dark energy, etc.) The following image is a representation of the photon detected in a positively curved space. Cosmology - Quick Guide - Cosmology is the study of the universe. The curvature is a quantity describing how the geometry of a space differs locally from the one of the flat space.The curvature of any locally isotropic space (and hence of a locally isotropic universe) falls into one of the three following cases: . ... it means the curvature is positive. According to Einstein, the curvature of the Universe is completely a consequence of its matter-energy content. This also influences the evolution and the fate of the Universe, as shown in the table. ... then the true age of universe is given by Spacetime Metrics A metric defines the distance between two points. A possible origin of the positive curvature is discussed in section 4.