08/30/2026
Beneath our feet exists a fungal network so vast that its estimated length is measured on a cosmic scale.
Researchers and fungal scientists estimate that the total length of mycorrhizal mycelium in just the top 10 centimeters of Earth’s soil exceeds 450 quadrillion kilometers. That is roughly half the width of the Milky Way galaxy.
Mycelium is the branching network of microscopic fungal threads called hyphae. Much of the fungal kingdom lives in this hidden form rather than as the mushrooms we see above ground.
These underground networks are also essential to ecosystems. Mycorrhizal fungi connect with plant roots, helping plants obtain nutrients and water while receiving carbon from their plant partners. They also contribute to soil structure and nutrient cycling.
The comparison to the galaxy sounds almost impossible, but it comes from an estimate of fungal mycelium concentrated within a relatively thin layer of global soil.
It is a remarkable reminder that one of Earth’s largest biological networks is largely invisible, quietly operating beneath forests, grasslands, and fields.
Source: Studies in Fungi and SPUN research on global mycorrhizal networks.
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