The Distance Between Galaxies Is Worse Than You Think

Описание: The distance between galaxies is the most terrifying measurement in all of science. Even our nearest galactic neighbor, Andromeda, sits 2.5 million light-years away - so far that the light entering your eyes tonight left before humans existed. And between those galaxies? Almost nothing. One atom per cubic meter. A void so vast and so empty that it redefines what isolation means.

In this deep dive, we explore why intergalactic space is qualitatively different from anything else in the cosmos. We break down the true scale of galaxies, the shocking emptiness of the intergalactic medium, the architecture of the cosmic web, and why the expansion of the universe means 94% of all galaxies are already permanently beyond our reach - visible but untouchable, separated by distances that grow wider every second.

From the warm-hot intergalactic medium and the missing baryon problem to the cosmic event horizon and the inevitable isolation of Milkomeda, this is the full story of why the space between galaxies is the loneliest place in the universe - and why it's only getting lonelier.

Sources:

NASA/ESA — Hubble Space Telescope Mission. https://science.nasa.gov/mission/hubble/

Nicastro, F. et al. (2018). "Observations of the missing baryons in the warm–hot intergalactic medium." Nature, 558(7710), 406–409. https://doi.org/10.1038/s41586-018-02...

Macquart, J.-P. et al. (2020). "A census of baryons in the Universe from localized fast radio bursts." Nature, 581(7809), 391–395. https://doi.org/10.1038/s41586-020-23...

Krauss, L.M. & Scherrer, R.J. (2007). "The Return of a Static Universe and the End of Cosmology." General Relativity and Gravitation, 39, 1545–1550. https://doi.org/10.1007/s10714-007-04...

Sawala, T. et al. (2025). "The Milky Way and Andromeda galaxies may not collide." Nature Astronomy, 9(8), 1206–1217. https://arxiv.org/abs/2501.12510

#andromeda #galaxies #universe #cosmology #space #intergalactic #deepspace