Satana is technically (not fully) an inner planet Why? Keer - Proximity when Apex goes red hypergiant Ceiya - Proximity when Apex goes red hypergiant Toron - Proximity when Apex goes red hypergiant Helme - Several t-years before the end of Apex even began, it just randomly disappeared Blanket - Proximity when Apex goes red hypergiant Doritas - Far enough to survive the red giant phase, not far enough to escape the supernova Small One - Small One will be hit with the strongest force from the supernova (not heat, that's what killed Doritas), so it will be ejected and ultimately become a rouge planet. Where it will outlive the entire system (and Rofonophor's system). Pola - The force from Pola's distance will push it outwards, but not eject (every object beyond will face this, but the farther out, the less they get pushed, so the Apex planets will get slightly closer to eachother), so overtime, Pola's orbit will decay, making her eventually crash into the Apex, which is now a black hole. Satana - Satana's orbit is highly unstable on its own, because Satana isn't supposed to be there, there wasn't supposed to be a planet there, but because of Avon, there is, but Satana's orbit is stabilized by Pola and Sapo's gravity, so that's why its orbit appears stable, but once Pola's orbit decays (which every object will be moving closer because of orbital decay, but the closer they are, the quicker the orbit will decay because of gravity strength), Satana's orbit will only have the outward stabilizer, so Satana will be dragged right towards Sapo, eventually crashing into it.
