The Asteroid Biome spawns high above any planet, and consists of many floating chunks of Meteorite Rock, which often contain a variety of ores such as Plutonium Ore, Gold Ore, Silver Ore, Iron Ore, and Diamond Ore. It is a miniature version of the Asteroid Field Biome, in which the entire planet is composed of asteroids.
Great care must be taken at these heights, as the temperature can drop to very dangerous levels and there is no oxygen. Safely mining an asteroid requires an abundance of Camp Fires and Torches to provide warmth and a Survival System to provide breathable air. It is also advisable to wear warm armor, particularly Snow Infantry Armor or Impervium-based armor sets. Using a Space Heater seems to be the best way to survive in this biome.