Part 4/12:
The universe is a torrid tapestry filled with matter, energy, and immense gravitational forces, constantly evolving. As space expands, so does the distance between galaxies, leading to observable phenomena like the redshift—where distant celestial objects appear to recede from us.
This expansion cools the universe, which was once at unthinkable temperatures at its inception. Over time, matter and energy fused to form clusters, leading to the complex, interconnected web of galaxies we recognize today.