xensky submitted a new mod: Unlocked Tiers - Planet types are not locked to tiers Read more about this mod...
This mod was released after the 1.3 update (after June 9) so I suppose this should work with 1.3. It also has screenshot from 1.3.
Not good. The mod gives partial danger ratings to planets, so you can have planets with tiers like 4.2 or 5.5 This is bad because you cannot find a planet with a tier of exactly 6.0 (and you cannot get more than that either), therefore no planet can spawn with Solarium ore. The only source of Solarium with this mod are the anomaly asteroids monsters, and their treasure chests (because they can be tier 6), which isnt much.