Ball Lightning Has Been Witnessed for Centuries and Still Defies Explanation

On August 6, 1944, a glowing sphere roughly 20 centimeters across entered a house in Björkvik, Sweden, floated through the kitchen, and exited through a window, leaving a circular hole in the glass. The event was reported by multiple witnesses and appeared in a Swedish meteorological report. The object was ball lightning — one of thousands of documented sightings that span multiple centuries and every inhabited continent, and that physicists still cannot adequately explain.

Typical reports describe a luminous sphere between one centimeter and 50 centimeters in diameter, usually following a lightning strike, persisting for anywhere from one second to around 10 seconds, and dissolving either silently or with a pop. The color varies: red, orange, blue, white. The sphere sometimes moves with the wind; sometimes against it. Some reports describe it entering buildings through closed windows or even phone sockets.

For most of the 20th century, ball lightning was treated with the skepticism reserved for UFO sightings. That changed in 2014, when researchers at Northwest Normal University in Lanzhou, China, inadvertently captured a ball lightning event on high-speed video and a spectrometer while studying ordinary lightning. The spectrum showed silicon, iron, and calcium — consistent with vaporized soil — which supports one class of theories: that a lightning strike vaporizes minerals in the ground, and the resulting plasma briefly holds itself together through electromagnetic effects. But the theory doesn't account for ball lightning reported inside aircraft cockpits or sealed rooms.

At least 200 distinct theories have been proposed, ranging from plasmoids and microwave cavities to antimatter and even quantum effects. None fits all the observed data. The 2014 Chinese observation is the only scientifically documented case with spectral data.