How Big is the Universe? Your Brain Can't Comprehend the Answer | Michio Kaku

How Big Is the Universe? Your Brain Can't Comprehend the Answer Background String theorist Michio Kaku has long excelled at transforming profound cosmology into accessible narratives. This video explores the scale of the observable universe, taking you from Earth to the solar system, to the Milky Way, and then leaping to the boundary of the cosmic microwave background—layer by layer, unpacking the limits of human understanding. What to Expect Kaku doesn't merely list data—he reveals a counterintuitive truth: even traveling at the speed of light, we could never reach the edge of the universe. Interspersed with Hubble Deep Field imagery and the latest observational evidence, the video transforms the abstract figure of "13.8 billion years" into a vivid journey through spacetime. The highlight is the discussion of the unobservable universe—it may extend infinitely, far beyond what the human brain can concretely grasp. Who It's For Viewers curious about cosmology and eager to step outside everyday scales. No physics background required, but come prepared: you may feel temporarily dazed afterward. Viewing Tips Consider keeping paper handy to jot down the key levels, or watch in segments. The philosophical undertones at the end are worth a moment of quiet reflection. *Approximately 245 Chinese characters*