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There are many theories of how the Universe will die, but only a few are the popular ones. First of all The Big Rip, where expansion of space would beat gravity. At first galaxies would start to move away from each other faster than light speed, then they would split into individual stars (the night sky would become fully dark). After some time everything would be broken into atoms and later into elementary molecules. Finaly even space would be torn apart. Other theory, The Big Crunch is the reverse of The Big Rip. It says that gravity would beat the expansion and universe would collapse because of created black hole. Inside it the new universe would start from pieces swallowed by this black hole. This process of expansion and collapse could repeat forever.  The most likely theory is The Big Freeze. The universe would keep expanding because of dark energy (topic for another time) but wouldn't beat gravity. Stars would go out of fuel and die or collapse into black holes. After googo...

There are many beautiful and dynamic palaces in the Univerce , but most of its regions are very dark voids between galaxies. If you were in a place like this you wouldn't see anything. You couldn't say, you are surrounded by anything. Or could you? In fact, we know, there are many types of things travelling throuh intergalactic space. For example, rogue/ejected stars. Those are stars that don't have gravitational relation with any galaxy. The vast majority of them were created in a galaxies, but were ejected from them for example because of collision with other galaxies or because they gained tremendous velocities after interaction with a supermassive back hole in center of the galaxy.  Other intergalactic objects can be planets. They are used to be called rogue planets. From their definition we can say, they can drift through the space between stars in the galaxy or, just like rogue stars, through intergalactic blackness.  There are many other types of things outside galax...