Multiple choice If a ______star spins, it emits radio waves. It is called a Pulsar. Red Giant Supernova Neutron White Dwarf Reveal answer Fill a bubble to check yourself C Correct answer Explanation When a neutron star spins rapidly, it emits beams of electromagnetic radiation from its magnetic poles. As these beams sweep across Earth like a lighthouse, we detect regular pulses of radio waves, earning it the name 'pulsar' (pulsating star).