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
Nobody knows. Some astronomers think that a planetary system like ours, with small planets near the star and large planets farther out, is not typical. When we thought that our arrangement was typical, we had come up with ideas of why it should be that way, but now we know that not all planetary systems have that architecture.
It might be random, and this question is like asking why, in a family of four kids, the oldest two are boys and the youngest are girls. There is, in the vast majority of cases, no particular reason why a family should have a particular arrangement of sex and birth order. But if you’ve only met one family, you have no way of knowing that all families don’t follow that pattern.
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