Here’s what might spark ghostly will-o’-the-wisps

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Jostling microbubbles of aerial and methane tin create mini lightning zaps, laboratory tests show

A achromatic and achromatic engraving of a agleam ray hovering complete a swampy creek. Trees overhang nan h2o and 2 group are shown stepping nearby, while a castle looms successful nan background.

Glowing balls of bluish ray person been seen supra swamps and cemeteries astir nan world, arsenic seen successful this early 1800s engraving. Swamp will-o’-the-wisps are believed to beryllium nan burning of seeping methane gas. But what ignites that state has been shrouded successful mystery.

Grosvenor Prints (CC BY 4.0)

Under a midnight moon, Luigi Garlaschelli peered retired complete graves.

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sciencenews