Why are Inner Planets Rocky and Outer Planets Gaseous?

We all know the solar system contains two kinds of planets. The first four, Mercury through Mars, are quite small in size, and they are rocky planets, also called “terrestrial planets”.

The outer four are gaseous giants: from Jupiter to Neptune, they are called “Jovian planets” and they are immense balls of gas, with a central core.

While conditions on these planets can be very different from one another, each type of planet shares some similarities and offers its own set of challenges when it comes to exploration and observation. But where does this difference come from? Do all solar systems have rocky planets closer to their stars?

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