Voyager I is about to break into interstellar space – past the edge of our solar system. Or it may have already, we aren’t sure. What we do know is that it’s being bombarded by a lot more cosmic particles that are abundant outside of our solar system, but the sun keeps from entering it. The exact edge of the system is a pretty shaky boundary though, so hopefully when a few more calculations come in we can be a little more sure of where it is. 11.1 billion miles is pretty impressive for any little probe though!