Colonization of the outer Solar System the Solar System's gas giant planets for exploration and possibly mining of helium-3, which could have a very high value per unit mass as a thermonuclear fuel. The Jovian system in general has particular disadvantages for colonization, including its severe radiation environment and its particularly deep gravity well. Its radiation would deliver about 3,600 rems per day to unshielded colonists on Io and about 540 rems per day to unshielded colonists on Europa. Exposure to about 75 rems over a few days is enough to cause radiation poisoning, and about 500 rems over a few days is fatal. Jupiter itself,
Solar Jetman or anti-clockwise direction. The pod is subject to inertia but not drag physics depending on the level of gravity of the set planet. The constant pull of gravity changes every level, which makes stable flight challenging and manoeuvring the pod more difficult as the levels progress. "Solar Jetman" has twelve planets and one hidden planet, each with its own gravity and system of enemy-infested caverns. The goal is to navigate these caverns with small jetpods launched from an immobile mothership, on each planet bringing back a piece of the Golden Warpship and enough fuel to journey to the next one.