So I'm assuming the air on Paradise will probably be perfectly breathable then? No need for helmets?
A "no problem of contamination at all" line = a lot of happy people
Up to you to take it canon or not but according to weylandindustries.com, the first FTL-capable SEV (space exploration vehicle) is introduced on January 17, 2034. Best case scenario then : 70 years to reach the far side of the galaxy which is about 100 000 light-years wide.
So the 'far side' isn't what we think (Paradise being in the sagittarius arm in Spaihts' script) ... or the colony ship is an alien ship.