Midgard

Midgard is a big gas giant. It's moons include Protaea, Maia, Peleg, Mirage and Maelstrom and dozens of smaller moons. Radix and Monopolis are also found within Midgard's orbit. The highest moons (Maia and Peleg) are easier to reach (slower, lazy distant orbits, with days over 30 hours long.) The lower moons (Protaea and Maelstorm) are harder to reach and harder to leave because they are deeper in Midgard's gravity well. (The lower moons have fast orbits and days less than 30 hours long.)