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OCR: NEUTRON STARS AND PULSARS WHEN A MASSIVE STAR explodes as a Beam of radio supernova, its core may survive. If waves channeled the core has between 1.4 and 3 solar by magnetic field masses, gravity compresses it beyond the white-dwarf stage, until its protons Spinning Magnetic and electrons have been squeezed field lines neutron together to form neutrons. This type star of object is called a neutron star. When the star is about 10 km (6 miles) across, its contraction halts. Sweep Some neutron stars are detected from of beam Earth as pulsars, which, as they rotate, Axis of rotation emit two beams of radiation. STELLAR LIGHTHOUSE Young neutron stars spin rapidly and emit two powerful beams of radio waves that == sweep regularly across the sky. If a beam sweeps across the Earth, it may be dete ...