First off I'd like to tell you that I've only seen the anime version of knights of Sidonia and any thing that isn't from the anime I got from wiki. Now for the Mass Effect series I know a little bit more then Knights of Sidiona but, I've only had one playthough and a little reading on wiki so I can't be expected to know every little detail, but I will still try to use as much cannon information as possible. Oh and just to let you know I speak English so I'm just coming up with Japanese names off the top of my head and will eventually start using English names if it starts getting to much of a pain.

3395- After over a thousand years of fighting humanity had finally defeated last Gauna and, the people of Sidonia can now colonize the Lem system without worry. Though that didn't mean Sidonia stopped military production by a long shot, Kobayashi wouldn't have humanity them with their pants down when or if the Gauna returned. It seemed like it was going to be a golden age but, the newest made Tadugane warship 'Starry Night' detected something just on the edge of the Lem system. Believeing they had found a Gauna they left to eliminate it.

"What the hell is that." Said Ren the ensign for the new 'Starry Night'. "it's half as big as Sidonia." Said Sakura navigations officer. "Quit staring, helm bring us in closer I want to know what were dealing with." Shouted the Kakashi the ships captain as crewmen rushed to their stations. As the 'Starry Night' Slowly drifted towards the object, the captain started to go through the possibilities of what this object was. From what he could tell from the sensors and visual, it was 15Km long and, shaped like a tuning fork, with a set of rings in the center but, the most Strangest part is that sensors couldn't date the object. While he was thinking about what it could be he didn't notice that the rings started to rotate extremely fast and a glowing blue sphere started to form in the middle of the rings. "Captain." Said the ensign. Their was no response. "CAPTAIN!" Ren repeated Finally breaking from him from his daze to see what was happening. "What's going go." He asked already guessing the answer. "Everything was going fine until are ship breached the 10km distance mark then, the rings suddenly started to rapidly spin and increase in energy but, the scariest part is that its starting to pull us in." said the new ensign. "Could you repeat that." Said the captain. "THE OBJECT IS FORCEING ARE SHIP INTO IT!" Ren almost shouting the captain out of his disbelief. "Ready the Heigus particle cannon." Said the captain. "And helm see if we can pull away from that object before we do something rash." Said the captain. "Captain the Heigus particle cannon is ready to fire at your signal but, we were unable to pull away from the object, it's gravity is just to strong." said the ensign. "Captain we've just crossed the 2km distance mark and getting closer." Said the navigations officer. "I want us ready to fire the Heigus particle cannon the moment we cross the 1km mark." Said the Captain as their ship slowly gave into the pull of the object. "Captain we've crossed the 1Km mark." Said the navigations officer but, before the captain could give the order to fire, some type of blue lighting shot out of the object attaching itself to their ship as it started to engulf them just before they were slingshot across hundreds of light years in moments.

"Give me a report." Said the captain. "We seem to have traveled quite a distance based on our star charts." Said the Sakura. "Sir, your not going to believe this but, behind us is an identical object as the one we found in the Lem system." Said the surprised navigations officer as she put the said object on the visual. "So It would be okay to assume that this object serves as some sort of FTL transit." Said the captain. "It would seem but, it gets better this transit has taken us to a system with what we consider a 'Goldy Locks' planet and it gets better if my readings are correct and its not a new type of Gauna then it's safe to assume that there's another one of these tuning forks at the edge of the system." The navigations officer said as she jumped for joy. "This is simply amazing, Kobayashi needs to be informed as quickly as possible." Said the captain he ordered the crew to head back through the 'tuning fork' as they now took to calling it.

3495- Nearly a full century later Sidonia or the SSF(Sidonia space federation) as their called now have colonize several worlds thanks to the tuning forks and, their ability to clone made it easy to colonize new worlds, usually being able to find and fully populate a new world in a month. Plus immortality is no longer limited to the highest officials and, is freely offered to the common citizen. Even with many of the populace wanting to demilitarize Kobayashi knew that even if by some miracle they truly had defeated the Gauna, they weren't the only threat the galaxy had to offer but, in all consideration humanity truly had entered a golden age of exploration and prosperity. Unfortunately goes all good things must come to an end.

SSF Report- 3495

Capital- Sidonia

Systems- 162

Worlds- 210

Population- 9,000,000,000,000

Seed ships- 1(another one being built as a back up capital)

Tadugane Warships- 11,057

Hybrids- 108

Codex

Tudagane class warships- 723meters

Seed class ships- 29Kilometers

Turian cruiser- 500meters

Geth cruiser- 700meters

Geth dreadnought- 1190meters

Quarian cruiser- 643meters

Alliance frigate- 196meters

Alliance cruiser-707meters

Cerberus cruiser- 700meters

Oh and I got these measurements from wiki. Tell me what you think and if you'd like me to continue cause really I'd have left this story to someone else if some else was writing but, their wasn't a single crossover for Knights of Sidonia on star wars, mass effect, halo, or even star trek. Which surprised me considering all of these are about being in space.