Those would need to be very low-energy cats. You wouldn't be able to look at them for a very, very long time.
If my quick math is correct, for the de Broglie wavelength of a cat to be comparable to its width, it would need to be travelling no faster than about 10^-33 m/s.
If my quick math is correct, for the de Broglie wavelength of a cat to be comparable to its width, it would need to be travelling no faster than about 10^-33 m/s.