I mean, how do we get a certain quantity of gas matter to become an actual planet? Is there anything inside it? How is, say, Jupiter’s core?
In: Planetary Science
Gas, just like solids and liquids, has mass. This means that it generates gravity as well as gets pulled on by gravity.
So even a big cloud of gas will attract itself and clump together. Get enough gas and that gravity can be really strong and compress the clump a lot.
That said, solid matter does end up in those planets, they’re just mostly gas.
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