How did galaxies form from tiny quantum fluctuations? And what is the ultimate fate of the cosmos: the Big Freeze, the Big Crunch, or the Big Rip?

: A central focus is the "mysterious, invisible side" of the cosmos, noting that 95% of the universe is composed of dark matter and dark energy , which do not emit light but dictate the behavior of galaxies.

A deep dive into dark matter. You’ll discover why galaxies spin too fast, what MACHOs and WIMPs are, and how dark matter shaped the cosmic web.