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With all this information at hand, Hughes drew a potential connection between green fireballs—which can be caused by fast-moving meteors—and ball lightning.

“Ninety to 95% of all UFO sightings,” he said, “can be explained as weather balloons, flares, sky lanterns, planes flying in formation, secret military aircraft, birds reflecting the sun, planes reflecting the sun, blimps, helicopters, the planets Venus or Mars, meteors or meteorite space junk, satellites, swamp gas … ball lightning, ice crystals reflecting light off clouds, lights on the ground or lights reflected on a cockpit window, temperature inversions, punch clouds.”

The “Handbook of Unusual Natural Phenomena” was a weird and obscure tome packed with reports of such freaks of nature as ball lightning, luminescent tornadoes and “rogue waves” coming out of nowhere to swamp ships.

After earning enough money from his first published photo of rare ball lightning, Forster bought his first professional camera.

The movie is based on a story by Chinese author Cixin Liu — who’s best known for his Three-Body Problem trilogy and last year’s Ball Lightning.