The earth didn't flip on its axis, but the magnetic field has.
"The earth didn't flip on its axis, but the magnetic field has."
The magnetic field has and appears to be about to again. Pretty good consensus on that.
Flipping on its axis is a good more unlikely. A rotating earth acts like a giant gyro. It wants to keep moving in the same direction. A flip would force it out of that movement. Seems unlikely. Yet the theories are out there. I suspect that they exist to explain the changes in magnetic field that may also be explained by the magnetic field reversals. I'm agnostic on axis flip.