7. Mandela Effect
If we assume parallel universes exist, the Mandela Effect can be easily explained. Otherwise it’s just too weird. Basically, this theory tries to explain how so many people could be remembering past events incorrectly. It’s like mass hysteria, only there’s no hysteria. And it’s called the Mandela Effect, since millions of people believed Nelson Mandela was long gone, when they heard he officially died in 2013. It’s pretty weird, so watch the video.
8. Dark Matter
This is one of those strange hypotheses where the absence of something only proves its existence. The dark matter has never been seen, and we have zero proof that it’s real, yet some brainy nerds think that as much as 70% of the universe is made of the dark matter.
9. Cold Sun
I kept this one for dessert. There was this German-British astronomer dude named William Herschel, who hypothesized that our Sun was actually cold, and the star itself was populated by aliens that have fully adapted to the eternal shine. Yup. This used to be a theory as well, and I hope you appreciate modern scientists just a tiny bit more now.