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    Question ID:   16268         Current Version: 1
Question: What is interstellar medium?
Category: Science > Astronomy & Space
Keywords: space, empty, interstellar medium, material, ISM
Type: what
Rating:(0 ratings)    Views: 139    Discussions: 0   In Watch Lists: 1  

 
    Answer:

Interstellar medium is the gas and dust between stars, which fills the plane of the Galaxy much like air fills the world we live in. For centuries, scientists believed that the space between the stars was empty. It wasn't until the eighteenth century, when William Herschel observed nebulous patches of sky through his telescope, that serious consideration was given to the notion that interstellar space was something to study. It was only in the last century that observations of interstellar material suggested that it was not even uniformly distributed through space, but that it had a unique structure.

Source: NASA

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