The magnetic fields of planets demonstrate that rotation is a requirement for an object to produce a magnetic field. It is not surprising, then, that when a massive star collapses the rotation rate

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When a massive star collapses, its rotation rate increases due to the conservation of angular momentum, and as a result, the magnetic field strength also increases. This is because the magnetic field is generated by the movement of conductive materials (like the ionized gas in a star), and faster rotation leads to stronger magnetic fields.

The Magnetic Fields of Planets Demonstrate That Rotation Is a Requirement