In one miraculous game i stumbled upon a class 26 planet, when i moved to colonize, it gave me a planet event with the sponges and i wiped them out for a nice 38% boost to planet quality...

What's more, i had the precursor mine you found (700%), rare resources and minerals (%300 and %100), +%100 research, and two fertile fields worth +%100 each...

Needless to say i saved the beginning of that game with that planet for posterity...

In my first huge game that i'm currently playing, i'm just ending colonization the phase. I did very slow tech, 9 normal AI, abundent planets and stars (scattered). Besides the few 4-6 class planets left, almost every planet is colonized. I had a colony ship on the opposite side of the small section that was left to colonize. By the time it could cross the map to reach a habitable planet, that planet would surely be taken. There was one planet (unexplored) nearby that was bordered by 3 other races that wasn't colonized yet though. I decided to send my lonely colony ship to check it out. When he got in sensor range I saw 2 class 10 planets and a class 26, but also another colony ship headed to the star. Luckily, My ship was faster and I grabbed that class 26. While I didn't get an event to boost the quality, I had researched ethics right away (very slow tech took forever but instantly having mostly class 18 planets was worth it for the strategy i'm using) and chose neuttral, so now I have 32 workable tiles turn make this planet a super economical capital.

My best gem of a planet had 1 700% Manufacturing, 1 100% manufacturing, 2 100% happiness squares, 1 100% influence square !!! It was an 18 to start. It was the gem of my empire!

The wierdest event was an economic boom that lasted 1 TURN. I got the message at the start of a turn, did my moves, hit TUrn and got the "it has ended" message... It was a bit of a boggle.