Rogue Blue

Rogue Blue
Are there stars and planets to galaxies?

What is between the galaxies? Rogue stars and planets? Dark matter, white matter Blue matter?

Yes, there. When galaxies collide, a lot of stars (with planets revolving) are expelled from galaxies. This probably does not adversely affect the inhabitants of the hypothetical planet in any way, although they dramatically increase the difficulty of interstellar travel. Clusters of galaxies have a low-level diffuse glow in visible light caused by all the stars that have been lost from the galaxies and are loose inside the group. Outside groups, is damn near impossible to detect a normal star in intergalactic space. Since all galaxies are formed by collisions, the fraction of stars in galaxies could not be appreciably perhaps 10% (but that's just a guess).

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