Apulsar is a pulsating star, in which size, temperature, and light intensity vary regularly. a binary star in which matter from one star is falling onto the second star. a rapidly rotating neutron star, emitting beams of radio radiation and in some cases x-rays and visible light. an object at the center of each galaxy, providing energy from its rapid rotation.

some think that theories become laws, but theories and laws have separate and distinct roles in the scientific method. a law is a description of an observed phenomenon in the natural world that hold true every time it is tested. it doesn't explain why something is true; it just states that it is true.

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i don't understand. explain it clearly