Material from the early solar system that was never transformed into a planet is now left over in space. After the planets formed, particles collided and created space debris.
Radiation pressure from the sun and the powerful solar wind both helped to expel the gas from the solar nebula. By the end of the Heavy Bombardment period, part of the residual debris had been removed from the nebula. The nebular hypothesis is the theory of planetary creation that is most widely accepted. According to this theory, the Solar System was created 4.6 billion years ago as a result of the gravitational collapse of a massive molecular cloud that stretched across several light-years.
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