Well to get such a tile on your homeworld by using Ctrl-N in an immense map would require a damn huge amount of luck

Are you guys sure that you have seen every colonizable planet? I mean...it could be on that lvl4 Radioactive world nobody wanted to colonize...
Well, guess I'm lucky. I have yet to play a game where I DIDN'T find the 700% production AND 700% research tile eventually.
But then as written above, I play usually medium maps with lots of AIs, so I can be guaranteed that every single planet will be colonized asap.