“Scientists now think they know” The story of science, they think they know until another disproves the theory. Richard Feynman, one of the greatest of 20th Century scientists:
It doesn’t matter how beautiful your theory is, it doesn’t matter how smart you are. If it doesn’t agree with experiment, it’s wrong.
Maybe Uranus just got drunk and fell over....................
That’s my theory and I’m sticking to it!...............