Is there a reason why we have four “rock” planets lined up followed by four “gas” planets in a row, or is it merely coincidence?

Question

Is there a reason why we have four “rock” planets lined up followed by four “gas” planets in a row, or is it merely coincidence?

In: Planetary Science

Answer 1

To clarify what other’s have said. There’s a reason the gas ones are further out than the rocky ones. But the fact that it’s 4 to 4 is a complete coincidence.