Systems I think you mean and the temp should be Kelvin not Fahrenheit, but those minor niggles aside, it appears that 20k is the lowest you can go, I have a number with 20k but nothing lower, and there is a system within a system somewhere in the galaxy, I forget where, that has the star of the nearby system within the orbit of the other systems outer planets, you can't see them of course because you have to jump to generate the system, but the distance puts them almost on top of each other.
Yeah Kelvin. Mea culpa. I think that 20 deg. is the lowest, too.
The Stat Scanner plugin for Observatory says my lowest temp ever encountered was 20 K as well. So @varonica seems to be correct. I don't think a much lower temp is possible on a celestial body in reality, as it is pretty close to 0 K already. For comparison, Pluto's lowest temp is reported to be 33 or 24 K (depending on the language in which you read Wikipedia).
I am sorry, but I like splitting hairs: Kelvin is not expressed in degrees, just in Kelvin, because it's an absolute temperature scale, starting at absolute zero.
Interestingly in the Odyssey Beta I did encounter lower temperatures, but there's that other thing to consider here, 20 K is the "average" temperature for the planet, we don't tned to get min-max temps for planets, and that can vary depending on circumstances. So it may be possible to get spot temperatures that are lower. For instance I have sometimes had the situation where standing in the shadow under my ship it's 4 K or 5 K lower than out in the open on really hot planets, and day side versus night side can make a big difference, although I suppose if you are far enough from the nearest star that the temps are down at 20 K being on the day or night side probably won't make that much difference, so 20 K may be the lowest average temp but not the absolute minimum temp you can encounter. In fact if 20 K is the average it would stand to reason there must be lower and higher temps, Will keep an eye on the on foot temps for really cold planets to see if they do drop below 20 K in places.
Look the temp on the picture below
Besides the famous system pair have the exact same coordinates, there's another system pair withing the bubble that are so close that one is actually inside the other when you are in one of them (in other words, when you are in one of them and target the other, it will be closer than most of the planets in the system. Although in the other system the distance is much larger for some reason. Still within flyable distance, though.) I don't remember which system pair it was, but it shouldn't be hard to find.
(And no, you can't supercruise from one system to another, no matter how close they may be. The game just doesn't load a system when you are in another. The jump animation to the other system serves effectively as a loading screen for that other system. If you supercruise to the position of the other system, which in the case of the pair of systems mentioned above is a question of minutes, there will be nothing there. Just the target marker for the other system and nothing else.)
(And no, you can't supercruise from one system to another, no matter how close they may be. The game just doesn't load a system when you are in another. The jump animation to the other system serves effectively as a loading screen for that other system. If you supercruise to the position of the other system, which in the case of the pair of systems mentioned above is a question of minutes, there will be nothing there. Just the target marker for the other system and nothing else.)
Considering the shortest distance between galaxies, that would be the Milky Way and the two 'companion' galaxies, the Small and Large Magellanic Clouds, respectively, at a distance of ca 206,000 light years and 163,000 light years, respectively. We're likely not getting there without the equivalent of 1984-Elite's Galactic Hyperspace, if Frontier should implement this in Elite: Dangerous.
Could be a fun way to shift the story around and discover new areas, new spacefaring species, though.
Could be a fun way to shift the story around and discover new areas, new spacefaring species, though.