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We propose a hypothesis of the truncation of stellar discs based on themagnetic model of the rotation curve of spiral galaxies. Once the disc hadformed and acquired its present structure, approximately, three balanced forceswere acting on the initial gas: gravity and magnetic forces, inwards, andcentrifugal force. When stars are formed from this gas, the magnetic force issuddenly suppressed. Gravitation alone cannot retain the newly-formed stars andat birth places beyond a certain galactocentric radius they escape tointergalactic space. This radius is the so-called ``truncation radius'', whichis predicted to be at about 4-5 disc radial scale lengths, in promisingagreement with observations.

The truncation of stellar discs: The magnetic hypothesis