Okay, we know that Red Dwarf is absolutely ages away from the solar system. It still is. We know that it basically kept going in a straight line for three million years (which does not put it three million light years out - it may not even put it one light year out). And then of course you've got the brief moment Red Dwarf made it to light speed which puts it further out (or closer, but I think it was facing away and Holly intended to turn around). But, of course, there have been creeping bits of human interference coming along, including: 1 - Kryten. If you follow the explanation in Infinity Welcomes Careful Drivers, the Nova 5 had a drive that could cover huge distances pretty much instantly. We'll use that, and say that humanity develops such drives. 2 - Hudzen. Of course, he was tracking Kryten and had been alone for millions of years, so we're happy with him being there. Apart from trying to kill everyone. 3 - Polymorph (not in order). Yep, the Polymorph was drifting in space, though obviously things can drift very fast in space. I guess I'm kinda happy with that. I believe Kryten, before leaving Earth, had heard of Polymorphs before (and we'll say he left the solar system a few years/decades/centuries after Red Dwarf), so I guess it's feasible that the Polymorph could have been there, especially if Red Dwarf had turned around. 4 - well, now we start getting into confusing territory. The ship Camille was on, to start with. Camille being a GELF. We'll just say that they left the solar system and started spreading through deep space. 5 - the DNA ship. Again, like the Polymorph, guess it just found its way there (we also have to accept that, with it being a ship, it probably travelled at least some of the way) 6 - the Justice station, and the simulant. Now we're getting somewhere. How did the entire station make its way there? And the simulant? And what are the chances of encountering both at roughly the same time? Has humanity spread that far (and is so thinly stretched that the Red Dwarf crew haven't encountered any living people yet)? Has something happened that "forced" things out of the solar system? 7 - the waxdroid planet in Meltdown. It's an entire smegging planet! I guess this could be significantly closer to Earth (because they got there using the matter paddle, though Earth must be beyond its reach). Did whoever built the waxdroid park decide to use a far-flung planet, Jurassic Park style, and have people come there? 8 - Lanstrom's facility in Quarantine. On an ice planet. Again, is humanity operating that far out, or did something happen to force the ice planet away from its natural orbit? Something like a sun exploding? 9 - the wreckage of the Esperanto in Back To Reality. I guess this can be somewhat forgiven as it's a seeding ship, and was looking at terraforming the planet - ergo, like the explanation for the Nova 5 and Kryten, I gather it would have either a faster-than-light drive, or like in The Last Human, have travelled there with the crew in stasis. 10 - oh God, most of series 6. Psirens includes wreckage of human craft, and the titular Psirens themselves. Legion's station. The simulants. The GELFS. And, of course, the experimental craft from Out Of Time (although that was said to have been set for deep space as a safeguard to protect itself from thieves and looters). And of course, we've got the other simulant and Abe from Beyond A Joke, the Leviathan and the different planets in Epideme, Cassandra, the ship with the time wand in Pete (though I guess that can be given the same explanation as the ship in Out Of Time), the escape pod in Only The Good, the Trojan, the facility in Entangled, and the simulants in The Beginning. Not quite so lonely. Red Dwarf is clearly travelling through territory which humans have been through in one shape or another, but it is so sparsely populated (for whatever reason - either by humans, GELFs or sims) that they're still practically alone.