how did astronomers use technology to identify characteristics of the crab nebula?\ntechnology that detects…

how did astronomers use technology to identify characteristics of the crab nebula?\ntechnology that detects ultraviolet light found hydrogen in the nebula\ntechnology that detects radio waves identified a pulsar at the center of the nebula\ntechnology that detects microwaves revealed the behavior of electrons in the nebula\ntechnology that detects gamma rays measured the distance of the nebula from earth

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