All the radiation from stars is the result of nuclear fusion in their cores.
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The act of using senses or tools to gather information is called <em>Obser</em><em>vation</em><em>.</em>
Answer:
Sound waves. Anything that vibrates is producing sound; soundis simply a longitudinal wave passing through a medium via the vibration of particles in themedium. Consider a sound wavetraveling in air
