Will-o'-the-Wisps, Ghost Lights and Phantom Ships

Across Europe, a faint flame seen over marsh or bog at night, one that drifted away when anyone walked toward it, went by many names. In English it was the will-o'-the-wisp, "Will with a wisp", a wisp being a twist of burning straw used as a torch, or the jack-o'-lantern. Scholars called it ignis fatuus, Latin for "foolish fire". Stories said it lured travelers off safe paths and into the mire. Some tellers made it a soul barred from both heaven and hell, others a mischievous fairy.

Many cultures have their own lights of this kind, and they are often tied to death. In Wales the canwyll corff, the corpse candle, was a light said to leave the house of someone about to die and travel slowly along the road the funeral would later take to the churchyard. In Japan, hitodama are glowing balls described as souls leaving the body, while kitsunebi, fox fire, are lights said to be made by foxes. Similar lights appear in folklore from the Americas, Africa and Asia.

What these traditions share is an experience that was once common for anyone walking at night before electric light: a glow in the distance that seemed to move, could not be reached and vanished when approached. The question for science has been whether some of those glows were a real natural phenomenon, and if so, what.

The oldest natural explanation is marsh gas. In 1776 the Italian physicist Alessandro Volta collected the flammable gas bubbling up from the mud of marshes on Lake Maggiore, the gas now called methane, and later writers proposed that methane from rotting vegetation might catch fire over wetlands. Methane does not ignite on its own at ordinary temperatures, so the usual version of the theory adds phosphorus compounds released by decay, such as diphosphane, which can ignite on contact with air and might light the methane.

The trouble is that no one has convincingly reproduced a natural will-o'-the-wisp. The Italian chemist Luigi Garlaschelli and his colleague Paolo Boschetti produced cool, faint flames from phosphine mixtures in the laboratory, but theirs glowed greenish rather than the bluish light in many reports. In 2025 a team from Richard Zare's laboratory at Stanford University proposed a different trigger: tiny electrical sparks, which they called microlightning, between charged bubbles of methane rising through water. Critics, Garlaschelli among them, noted that the experiment took place underwater while wisps are said to hover in the air. Other suggestions, such as glowing fungi and luminous insects, may account for some reports but not the classic moving flame.

The honest summary is that the explanation is not settled. Good modern reports have also become rare, which makes the question hard to test. Some researchers suggest that drained wetlands and brighter nights are part of the reason, but that too is a hypothesis.

Some ghost lights have been studied directly. Above Brown Mountain in Burke County, North Carolina, lights have been reported along the ridge since at least the early 1910s; a Charlotte newspaper described them in September 1913. The U.S. Geological Survey investigated twice. In 1913 D. B. Sterrett concluded that the lights were locomotive headlights seen from a distance. When people said the lights continued after a 1916 flood halted the trains, many doubted him, so in 1922 George Mansfield returned with a map and a surveying sight called an alidade. He traced the lights to car and train headlights, fixed lights and brush fires. More recently, rooftop cameras run by Appalachian State University had logged thousands of hours of the view by 2014 without capturing a light the project could not explain.

Near Marfa in West Texas, visitors gather at a roadside viewing area east of town to watch for lights over the plain. Local lore traces the first report to a cowhand in 1883, but the first published account was a 1957 magazine article. In May 2004 a team from the Society of Physics Students at the University of Texas at Dallas spent four days with video cameras, traffic counters and chase cars and concluded that the lights they recorded could be attributed to vehicle headlights on U.S. Highway 67. In 2008 researchers from Texas State University watched for 20 nights with spectroscopic equipment and reached a similar conclusion, attributing what they recorded to headlights or small fires, in a paper published in 2009.

Believers point out that some reports describe lights behaving unlike any car. Some researchers add that layers of warm and cool desert air can bend distant light into mirages, making ordinary headlights appear to float, split or bob.

The most famous phantom ship is the Flying Dutchman, a vessel doomed to sail forever without making port, usually off the Cape of Good Hope; to see it was an omen of disaster. The legend appears in print in the late 18th century, in a 1790 travel book by John MacDonald and in a 1795 account of a voyage to Botany Bay attributed to George Barrington. An 1821 story in Blackwood's Magazine named the captain Hendrick van der Decken, and Richard Wagner's opera Der fliegende Holländer (1843) carried the tale around the world. No real ship has ever been identified as the original.

The best-known report comes from the Royal Navy. A journal of the world cruise of HMS Bacchante, on which the young princes Albert Victor and George, the future King George V, were serving, records that at 4 a.m. on 11 July 1881, while their squadron was off the coast of Australia, a strange red light like a phantom ship was seen, and that thirteen people saw her. The journal was published under the princes' names, but later editing makes it uncertain who wrote the entry.

Other coasts have their own ships. Off the island of Chiloé in southern Chile, fishermen tell of the Caleuche, a brilliantly lit ship crewed by the drowned, heard with music and laughter before it vanishes into the fog; some scholars think it partly adapts the Dutchman legend. Sailors also saw a real glow at sea, St. Elmo's fire, a bluish electrical discharge that forms on masts in stormy weather and was named for St. Erasmus, a patron saint of sailors. It is a reminder that sea folklore grew from real and genuinely strange sights.

The physical explanation most often offered for phantom ships is a superior mirage. Normally air grows cooler with height. Over cold sea the reverse can happen, with a layer of cold, dense air at the surface trapped beneath warmer air above. Light from a distant object bends as it passes through these layers, so a ship far away, even one below the horizon, can appear lifted above the water, stretched tall, turned upside down, or stacked into several images. The complex, shifting form of this mirage is called the Fata Morgana, Italian for Morgan le Fay, the sorceress of Arthurian legend, because in the Strait of Messina between Sicily and mainland Italy the mirages looked like castles floating in the air.

To a sailor without the physics, a ship hanging above the waves, or a ship appearing where no ship could be, is a ghost ship. Many researchers regard the superior mirage as the most credible explanation for daytime reports of the Flying Dutchman, which is so often described as floating above the sea. A mirage does not explain everything, such as a light seen at night or a crew seen on deck, but it does show how real light and honest eyes can produce a vessel that is not where it appears to be.

The same lesson runs through every story in this article. Most ghost lights are real light, seen by real people and misjudged in distance, size or source. Finding the source does not make the experience less striking, and it does not mean every report has been solved.