Maldek or Rocky Remnants? Let's begin with the commonly proposed scientific theories of how the asteroid belt originally formed. For the most part, the explanations center around leftover material from the early Solar System. There are 4 primary schools of thought. The first is the Failed Planet Theory. According to Wikipedia "Dust and rock between Mars and Jupiter began to accrete into planetesimals, but Jupiter's gravity stirred the region so strongly that the material kept