A strand of the cosmic web

Filament picture shows part of the structure that underpins the whole Universe

After hundreds of hours of observing time with the Very Large Telescope at the European Southern Observatory in Chile, a team of astronomers have managed to create the most detailed image ever of one single filament of gas connecting galaxies together (shown in purple, below). The cosmos is strung together by these tenuous filaments of gas that, combined, form an interconnected mesh known as the ‘cosmic web’ which funnels gas between galaxies and provides the scaffolding on which our Universe is built. These filaments are extremely difficult to capture, as they’re incredibly dim, but the light from the filament stretches three million lightyears between two actively growing galaxies. “By capturing the faint light emitted by this filament, which travelled for just under 12 billion years to reach Earth, we were…

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BBC Sky at Night United Kingdom (Digital) - 1 Issue, April 2025

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