the order is Mercury, Venus, Earth, Mars, Reef, JUPITER, Saturn
did we just skip over Jupiter and all its moons, like it's literally the biggest planetary body.
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Up until the arrival of Oryx from outside or solar system, we had no need to travel beyond the reef. Keep in mind that the reef (where the awoken is) supposedly lies on the brink between the light and the darkness, so the vanguard may have deemed it too dangerous to go there. The only reason we went to Saturn is because the awoken fleet disabled the Dreadnaught whilst it was passing by. We've no reason to go to Jupiter yet so why would we?