Angular momentum is definitely quantized in elementary particles and electrons in atoms.
Molecules also have characteristic rotation spectra.
Is it true that all angular momentum is quantized, including big things like automobile tires, flywheels and planets?
If so what is the largest object for which this quantized rotation has been verified/observed/measured?

Angular momentum is definitely quantized in elementary particles and electrons in atoms. Molecules also have characteristic rotation spectra.

1. Is it true that all angular momentum is quantized, including big things like automobile tires, flywheels and planets?

2. If so what is the largest object for which this quantized rotation has been verified/observed/measured?