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,
The War in Space third planet of the Yomi system in the Messier 13 nebula, 22,000 light years from our solar system. Takigawa then asks him why they want to take over Earth. Commander Hell tells him that their planet has died and that they need a new planet to live on. He then warns them that if they attack they will all die. The Gohten makes it to Venus and Miyoshi, Muroi and Jimmy use a small lander to find the alien spaceship. They find the enemy spaceship (later named the Daimakan) in a large cave with a force field around it. They