Describe the composition of the interstellar medium. Explain how it has been possible to map the HI clouds.

The interstellar medium (ISM) is the matter that exists between stars in a galaxy. It primarily consists of gas (about 99%) and dust (around 1%). The gaseous component is predominantly hydrogen, existing in various forms such as neutral atomic hydrogen _________ ____ ___ _____ _____ ____ ____ _____ ______ _________.
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