I've still yet to see a game where all artifacts spawn at normal probabilities, and I've played all the biggest stock systems.
I've found them all in the huge multi-system random map (and got a legit 100% acheivements). I found all 12 once, including the new entrenchment artifacts, and here is a picture to prove it. No cheating. Except for this: Start game, Save, Surrender, Keep Playing, view all artifact locations, Reload, and aquire & explore those locations.
Space Ponies are often on Pirate Bases. So take over the base, and then explore it. (Space Ponies is not an artifact, its a planet special ability).