In playing Stellaris, you are essentially roleplaying and trying to conquer a galaxy. There are M/Billions of galaxies in the Universe (great DLC expansion if we can do multiple galaxies) and a random question came up -- are there stars/solar systems between galaxies just floating around intergalactic space.
Apparently there are:
Lost in Space: Half of All Stars Drifting Free of Galaxies | Space
Quote:
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Instead, this finding of bright, blue light unexpectedly reveals these fluctuations may come from something called "intrahalo light," which is created by stars flung into intergalactic space during titanic collisions and mergers of galaxies. The researchers found that there was as much light from these intergalactic stars as there was from stars located in galaxies.
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Then the next follow-up question is ... are those orphaned stars like solar systems and still have planets going around it? My guess is, in some cases, yes (but have not been able to find anything that specifically addresses planets)