+The Interstellar Medium (ISM) is the matter and [Energy](/wiki/energy) that fills the vast space between [Stars](/wiki/stars) within a galaxy. This cosmic ocean of gas, dust, and cosmic rays constantly cycles materials, forming the very building blocks for new stellar systems.
+## See also
+- [Galaxy](/wiki/galaxy)
+- [Nebula](/wiki/nebula)
+- [Star Formation](/wiki/star_formation)
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