Part 7/10:
Creating a triangle across the cosmos—akin to testing the flatness of space—reveals our spatial understanding. Scholars utilize Cosmic Microwave Background (CMB) observations, examining tiny temperature variations that provide insights into the early universe's density and composition.
Contemplating the geometry of the universe raises further questions around its infinite versus finite nature, impacting our understanding of extension beyond observable boundaries. Here, the principle of cosmic inflation addresses much of the observable flatness of the universe, arguing a brief period of rapid expansion smoothed out any initial curvatures.