The Distance Between Galaxies Is Worse Than You Think | Michio Kaku

The total duration is approximately 20-30 minutes, and it is recommended to allocate a continuous viewing time to fully enjoy the experience. This video is presented by the renowned theoretical physicist Kimura Hideki, focusing on astonishing facts about the distances between galaxies on a cosmic scale. The content starts from the limitations of human understanding of the universe, dissecting core concepts such as galaxy redshift, Hubble's Law, and cosmic expansion, and revealing the physical logic behind the statement that "the observable universe's edge is 9.3 billion light-years away from us." Kimura Hideki is skilled at transforming abstract theories into concrete metaphors, making the complex framework of cosmology easy to understand. The key highlights clarify common misunderstandings among the public about "the speed of light limit" and "the rate of cosmic expansion"—explaining why galaxies can recede at superluminal speeds without violating relativity. It also extends to cutting-edge research on dark energy-driven accelerated expansion, prompting reflection on the ultimate fate of the universe. It is suitable for science enthusiasts interested in astrophysics and cosmology, as well as high school students and above who are studying physics. It is recommended to watch it along with a cosmic scale illustration for a more effective experience.