Question: Earth is part of a solar system and a galaxy. Are there any lone planets or stars out there that aren't part of a galaxy or group of extra-terrestrial objects?

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  1. Almost definitely, yes!

    In our galaxy, we know that there are planets that are floating off by themselves, not orbiting any stars. We know that there are stars that are not part of any galaxy: we have measured their light in between galaxies. So it makes sense that there might also be planets that are not orbiting stars or part of galaxies (although we haven’t seen these directly).