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Scientists Identify Microlightning as Source of Mysterious Blue Marsh Lights

Scientists Identify Microlightning as Source of Mysterious Blue Marsh Lights

Lab experiments reveal will-o’-the-wisps result from tiny electric sparks igniting methane in wetlands, shedding light on ancient legends.

Written by Gadgets 360 Staff | Updated: 5 October 2025 18:02 IST

Scientists Identify Microlightning as Source of Mysterious Blue Marsh Lights

Photo Credit: Wikipedia Common

Mystery of Will-o’-the-Wisps Solved: Microlightning Sparks Methane to Create Ghostly Swamp Lights

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Highlights

Will-o’-the-wisps come from tiny sparks between methane bubbles
Lab recreated swamp conditions, capturing microlightning flashes
Electric charges can trigger natural chemical reactions in wetlands

For hundreds of years, people have spun stories of ghostly balls of blue light floating above marshes and swamps, called will-o'-the-wisps or “foolish fire.” They were believed to be ghosts, spirits or tricksters luring people off the right path. Now, a new lab study has tried to determine whether those mysterious embers might actually all begin life as feeble flares, being microlightning that ignites methane gas rising upward from deteriorating plants. This new concept sheds light on how a ‘flame' can exist where there's no obvious source of fire.

Scientists Uncover Microlightning as the Source of Ghostly Blue Marsh Lights

As per Science.org, the phenomenon occurs where wetlands generate methane from decomposing vegetation. That gas rises through water and emerges as microbubbles at the surface. Each one can bear an electric charge, carrying some positive, some negative.

When oppositely charged bubbles come close to each other, a small electric discharge, a microspark, can exactly leap between them. That spark gives methane a faint glow and produces the eerie blue light we see in the legends.

Study Links Microbial Colonization to Ancient Meteorite Crater

The Spark Mechanism: Scientists Link Ghostly Blue Marsh Lights to Microlightning

The scientists made a tank mimicking swamp conditions, filled with water and methane bubbles. With high-speed video and sensitive light detectors, they caught extremely short blips between bubbles in dense bubbling. These flashes are the microlightning events that can trigger methane oxidation. Experiments demonstrate that the system operates without requiring extreme heat or external ignition.

Beyond the Glow

This research not only illuminates folklore but hints at a more general principle: under the right circumstances, electrical charges at interfaces (like where gas and water meet) can drive chemical reactions naturally. If that's the case, then microlightning might also be participating in other natural venues, not only marshes.

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