On the table of Worlds:
1) Terrestiral Worlds (0.1 to +7 Earth masses) is a 30% Chance
2) Dwarf Planets (0.1 to 7 Moon Masses) is a 24% Chance
3) Asteroids (01.1 to 7 Ceres Masses ) is a 16% Chance.
When ever rolling a Giant (Ice Giants like Neptune or Uranus, Gas Planets, Hot saturns, Hot Jupiters etc...) this triggers a second roll for Terrestrial, Dwarf, or Asteroid.
Habitat is Simplified in a Table for Dwarf and Terrestrial. the 2D6 table just gives types of words in these Category by their "habitability" Starting with their Position in the Solar System* to their
*If rolling a Ice or Gas Planet which cannot be closer than the Freezing Line/Snow Line this alters the Host Planet - making it a Hot Saturn/Giant.
Its fun to imagine the birth of a Solar System: Lighter Volatiles flying farther out Creating Gas and Ice Giants 40AU*Stellar Magnitude , while Heavier Elements and Metals staying Closer. Condensing into their respective planets the way a prospector uses the different masses to filter for gold on a river.
Then random stuff happens - from Collisions, Captures, Ejections (accidental Gravity Slingshots) - Browning Motion scaled up to the size of Planets and the Time scales of Millenia to Millions, and Billions of Years! As well the Stellar Systems Passing Through Clouds cosmic Dust and Gaining mass, elements, and variances to their Relationships.
Then imagining the TL6-TL9.0 Civilizations from TL7 (2000AD) Earth Economies Sizes https://en.wikipedia.org/wiki/Gross_world_product?wprov=sfti1 (0.01 to 100,000x 80Trillion USD GDP)