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According to the Blackett conjecture, any neutral rotating body acquires amagnetic moment proportional to its angular momentum. Using the data on thedipolar magnetic field of Mars, we put a stringent upper limit on the value ofthe Blackett's constant, the dimensionless constant that relates the magneticmoment to the angular momentum. As a consequence, the Blackett effect cannotdirectly account for the magnetic fields of celestial bodies and galaxies. Wealso show that the Blackett effect cannot be tested in a laboratory since themagnetic moment of any rotating lab-scale object would be much smaller than theone produced by the well-known Barnett effect.

Can the Blackett conjecture directly account for the magnetic fields of  celestial bodies and galaxies? And, is a lab-based test for the Blackett  conjecture feasible?