Chapter 4 is about signals that looked artificial and pictures that were. In 1967 Cambridge research student Jocelyn Bell Burnell found a radio pulse repeating every 1.337 seconds; the team nicknamed it LGM-1, for Little Green Men, and it turned out to be the first pulsar recognised, a natural object. On 15 August 1977 Jerry Ehman circled 6EQUJ5 on a printout from Ohio’s Big Ear telescope and wrote Wow! beside it; the 72-second signal was never detected again, and a 2024 preprint proposes a natural cause in a hydrogen cloud. In Belgium in 1989 and 1990, about 143 initial reports of lit triangles led to F-16s being sent up on 30 March 1990, and the pilots saw nothing; the most famous photo was confessed as a polystyrene model in 2011. In 1995 a film claimed to show an alien autopsy; in 2006 its maker admitted it was staged with plaster dummies full of jam and sheep brains. In Phoenix in 1997, the hovering lights were flares from A-10 jets.
20 UFO Sightings and What Really Happened is a set of true stories in six short chapters, each on its own page. Tap the right side of the screen for the next slide and the left side to go back, hold to pause, and use the button at the end of a chapter for the next one. Three parts are written live by AI and labelled: a read of your answers, the Sky Desk and a what-if scene. The AI is told not to invent facts and can still make mistakes; if it is busy, a hand-written text appears instead and says so.
Every story was checked on 16 October 2026 against pages we opened, all listed on the first page. What witnesses said they saw is told as their account. The pictures are open-licence photos from Wikimedia Commons and our own drawings; no film stills or official art are used. Your answers stay in this browser tab and are cleared when you close it. Spotted a mistake? Use the Contact page.
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