Part 6/10:
As we deepen our understanding, the discussion shifts to the geometry governing our universe. Contrary to initial intuitions, an expanding universe doesn't imply movement through space; rather, it indicates space itself is stretching. Familiar analogies, such as a rising loaf of bread or expanding balloons support this notion, indicating galaxies that appear to be receding are not actually moving through space.
The universe's fabric may be described through Minkowski and de Sitter spaces; Minkowski represents a 'flat' universe while de Sitter allows for curvature. Our universe’s topology remains an enigma, challenged by ideas about closed and open geometries—each leading to different interpretations of cosmic structure and behavior.