So there are big galaxies floating around in the vast of space, but what’s between them? Stars? Rogue planets? Nothing?
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Very dispersed gas, dust, and the occasional wandering stars and rogue planets – though I’m not sure you can call it a planet if it’s not orbiting a star.
At the distance away we’re talking about individual stars are virtually undetectable unless you happen to have access to the Hubble Space Telescope, or maybe some of the larger observatories when conditions are really really good. They’re also sufficiently rare that even with these you have to really be looking for them.
For an idea of intergalactic stellar visibility with the naked eye – the Andromeda galaxy is the closest galaxy. If we could see the actual stars from earth it would show up [several times the size of the moon](https://www.astronomytrek.com/wp-content/uploads/2017/03/Andromeda-Full-Moon-Comparison.jpg). but all we can detect with our eyes is the galactic core and it just looks like a single fairly bright star.
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