Question

what is Interstellar space?​

Answer 1

Interplanetary space is the area between planets in the solar system. Moving up on the scale is interstellar space or the area between stars within the same galaxy.

Answer 2

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In astronomy, the interstellar medium is the matter and radiation that exists in the space between the star systems in a galaxy. This matter includes gas in ionic, atomic, and molecular form, as well as dust and cosmic rays. It fills interstellar space and blends smoothly into the surrounding intergalactic space.