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
Most star systems are binary, they have 2 stars. Jupiter is the “would be” second star but it did not accumulate enough matter to become a star. That is why Jupiter is so much bigger than the other planets, it is basically a failed star.
Once the Sun formed it sucked in most of the matter of the inner solar system due to its extremely strong gravity, and its solar winds pushed lighter elements outward.
The rest of the matter that Jupiter was not able to capture formed into Saturn, Uranus, and Neptune in the outer rings. That is why we have 4 big gas and ice giant outer planets.
The 4 small inner rocky planets are the made from the heavier elements not captured or pushed away by the Sun.
I suspect the combined gravity of Saturn, Uranus, and Neptune kept Jupiter from moving closer to the Sun, thus protecting the tiny inner planets from being absorbed or flung out of the solar system. I read a theory that said Saturn actually used to be closer to the Sun than Jupiter, but as Jupiter moved inward it pushed Saturn outward and that Saturns gravity helped slow Jupiters inward progress and keep it where it is now.
Our solar system is just amazing and everything happened perfectly right to result in Earth being the paradise that it is.
Most of these comments are off topic, do not address the question properly, or just completely wrong.
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