Why does the solar nebula theory predict that planetary systems are common?

Answer 1

The solar nebula theory posits that planetary systems form from the gravitational collapse of a rotating cloud of gas and dust, known as a nebula. As the nebula contracts, it flattens into a disk, allowing for the accumulation of material that eventually coalesces into planets. Given that such nebulae are prevalent in the universe and the processes involved are relatively common, the theory suggests that the formation of planetary systems is a widespread phenomenon across different star-forming regions. Consequently, this leads to the expectation that many stars will host their own systems of planets.