Fill in the missing Gods, in the correct order:
Credit to my daughter for the inspiration for this puzzle!
The answer is:
The connection/order is:
the Greek/Roman equivalent names of the gods for whom the planets of the solar system are named. They’re all Roman->Greek except Uranus->Caelus.
3 should be GAIA, 6 should be CHRONOS/CRONOS/KRONOS, 7 should be OURANOS, 8 should be POSEIDON. The actual names of the planets are all taken from the Romans, but they took URANUS directly from the Greek, simply Latinizing the spelling. The list provided is the Greek equivalent mythic figures to the names of the planets (1 - MERCURY, 2 - VENUS, 4 - MARS, 5 - JUPITER). If you hold that PLUTO should remain among the planets, this name, too, was a Latinization of Greek PLOUTON. The Roman equivalent was DIS PATER/DISPATER.