The Space Between Galaxies Is Worse Than You Think

The space between galaxies is not just far. It is a category of emptiness so extreme that it redefines what "nothing" means. Every deep-field photograph you have ever seen compresses billions of light-years of void into a flat image, making the universe look crowded. It is not. Eighty percent of the cosmos is void. The space between stars, already a near-perfect vacuum, is roughly a million times denser than the space between galaxies. Out there, in the intergalactic medium, a room-sized volume of space contains fewer than twenty atoms. No stars. No dust. No landmarks. Just a ghost-thin plasma stretching millions of light-years in every direction. In this video, we journey from the inside of the Milky Way to the edge of our galaxy, across the two-and-a-half-million-light-year void to Andromeda, through the Local Group, past the Virgo Cluster, and out into the cosmic web and the great voids that dominate the structure of the universe. We cover the 2025 Nature Astronomy study that revealed the Milky Way–Andromeda collision may never happen, why galaxy collisions are mostly empty space passing through empty space, what hypervelocity rogue stars tell us about intergalactic isolation, how scientists finally found the universe's missing matter hiding between galaxies, and why the accelerating expansion of space will eventually erase every galaxy beyond our own from the observable sky. This is not a "space is big" video. This is the story of why intergalactic distance is not a travel problem — it is a structural emptiness where almost every familiar landmark disappears. We’re now live on Spotify 🎧 https://open.spotify.com/show/033oDyu... Sources: Sawala, T., Cautun, M., Frenk, C. et al. (2025). "The uncertain satisfactory of the Milky Way–Andromeda collision." Nature Astronomy. https://doi.org/10.1038/s41550-025-02... Nicastro, F. et al. (2018). "Observations of the missing baryons in the warm–hot intergalactic medium." Nature, 558, 406–409. https://doi.org/10.1038/s41586-018-02... Cautun, M. et al. (2014). "Evolution of the cosmic web." Monthly Notices of the Royal Astronomical Society, 441(4), 2923–2973. https://doi.org/10.1093/mnras/stu768 NASA Goddard Space Flight Center. "The Milky Way Galaxy." Imagine the Universe. https://imagine.gsfc.nasa.gov/science... Kirshner, R.P., Oemler, A., Schechter, P.L., Shectman, S.A. (1981). "A million cubic megaparsec void in Boötes." The Astrophysical Journal, 248, L57–L60. #IntergalacticSpace #CosmicVoid #SpaceDocumentary #Andromeda #CosmicWeb #MilkyWay #DeepSpace