The document discusses the concept of gravity as described by general relativity, emphasizing its nature as a consequence of spacetime curvature rather than a force. It highlights the historical transition of the idea of a cyclic universe from philosophical and religious contexts to scientific discussions, particularly through advancements in thermodynamics and relativity. Helge Kragh is mentioned as the author contributing to this perspective.

111. According to general theory of relativity gravity is not as
a force but as a consequence of the curvature of space
time. But what 3D structure of gravity that is not clear.

138. Until the mid-nineteenth century the age-old idea of a cyclic
or oscillating universe belonged to philosophical and
religious discourse, with little connection to the physical and
astronomical sciences. It was only with the emergence of
thermodynamics, and even more so with the general theory
of relativity, that it became possible to discuss the
hypothesis within a scientific context. - Helge Kragh