Just a kind of idea of where it's at right now - this was quickly whipped up and could obviously be less formulaic with a bit more effort:
The planet Mindartis, a gargantuan icy interplanetary age world, known for its deposits of copper in the east, warring factions, and its many active volanoes orbits a tiny yellow star. This planet is fourth in its system, has a dense atmosphere, 2 moons and a population of hundreds of millions. Its flag is a red oval on a violet triangle. Vaccination against harbek dyloma is recommended before visiting; symptoms include joint aches and coma.
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The planet Paelias, a gargantuan jungle medieval world, known for its deposits of iron in the northwest, remarkably fast horses, and its lawlessness orbits a huge violet star. This planet is tenth in its system, has a standard atmosphere, 2 moons and a population of tens of millions. Its flag is a indigo star on a violet triangle. Vaccination against fargrim opia is recommended before visiting; symptoms include itchiness and blurred vision.
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The planet Arannis, a small mountainous stone-age world, known for its deposits of adamantium in the west, unusual alien race - the Rhogar - , and its exotic plantlife orbits a small yellow star. This planet is eighth in its system, has a thin atmosphere, 3 moons and a population of trillions. Its flag is a orange square on a red triangle. Vaccination against orsik sclerosis is recommended before visiting; symptoms include convulsions and pustules.
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The planet Hadarai, a huge mountainous late industrial world, known for its deposits of tin in the east, exotic plantlife, and its hospitality to visitors orbits a gargantuan red star. This planet is third in its system, has a very thin atmosphere, 2 moons and a population of a few hundred. Its flag is a red circle on a blue hexagon. Vaccination against rangrim mycosis is recommended before visiting; symptoms include paranoia and convulsions.
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The planet Aramil, a large desert late industrial world, known for its deposits of lead in the northwest, hospitality to visitors, and its unfriendly natives orbits a small yellow star. This planet is third in its system, has a standard atmosphere, 1 moons and a population of tens of millions. Its flag is a red star on a indigo circle. Vaccination against harbek dystrophy is recommended before visiting; symptoms include joint aches and headache.