Asteroid

From SporeWiki, the knowledge base dedicated to Spore

Asteroids are large clumps of rocks organized in a belt, or can be found lone. In Spore, asteroids are found naturally. In the Cell stage, there is a comet which hits your Homeworld, but no asteroids appear. Sometimes, in the Creature stage, a meteor will hit your Homeworld, and large bone piles will appear in its place. In the Tribal stage no asteroids will appear. In Civilization stage, asteroids can be found in craters, but none will hit the planet. However, in the Space stage, the player can send meteors down the planet, using the Meteor Shower tool, heating up the planet.