Space between stars:
- In astronomy, the interstellar medium (ISM) is the matter and radiation that exist 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.
The component of a galaxy which is colorful is disk:
- The various colors in a galaxy (red bulge, blue disks) is due to the types of stars found in those galaxy regions, called its stellar population.
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