How Big Is the Universe Compared to Our Galaxy? | Michio Kaku

This is an astronomy educational video featuring renowned theoretical physicist Toshihide Maskawa. The film centers on a stunning question: just how vast is the cosmos? If we were to place the Milky Way within a coordinate system, where would it sit? The content begins with the basic scale of our galaxy and gradually introduces the scale of the observable universe, revealing an almost unimaginably enormous gap between the two—the Milky Way is merely one of hundreds of billions of galaxies, while the observable universe spans a diameter of 93 billion light-years. The highlight lies in using intuitive scale analogies to help viewers build a conceptual framework of "cosmic hierarchy," rather than simply overwhelming them with data. It is suited to general audiences interested in astronomy who wish to develop a sense of spatial scale from scratch, and also serves as an excellent supplementary resource for students. It is recommended to watch in a relaxed manner, pausing to reflect along the way. There is no need to memorize every figure—the key takeaway is to feel the place and humble insignificance of humanity within the cosmos.