Why do we have 4 ‘rock’ planets in a row then 4 ‘gas’ planets in a row?

Question

If we discount dwarf planets after the asteroid belt all planets are gas, is there a specific reason or is it just coincidence

In: 2019

Answer 1

Random luck. Most solar systems is gas planets sometimes even closer to it’s sun than Mercury is to ours then maybe rocky planets.

Now it might only seen like this because of our technology only able to detect massive planets Neptune size and bigger. Even the super earths are close to Neptune’s size. So until we get even better cameras or have a new detection method other than checking for the star wobble that massive mostly gas planets can do, it’s going to look like most solar systems we detect that has planets will have gas planets near their sun.