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From wikipedia

Gas giants are commonly said to lack solid surfaces, but it is closer to the truth to say that they lack surfaces altogether since the gases that make them up simply become thinner and thinner with increasing distance from the planets' centers, eventually becoming indistinguishable from the interplanetary medium. Therefore landing on a gas giant may or may not be possible, depending on the size and composition of its core.

How can I visualize a Gas Giants. E.G I want to land on Jupiter, what will I see? Will I be sucked towards the core since I am solid and planet is mostly made of gas? Could I possibly walk or I would just be floating?

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If you could make it down to the core, then yes, you would probably be able to experience a "solid surface" (where I put that in quotes for reasons that should be apparent in a moment).

The question really gets to, though, what you consider to be a "solid" and a "surface" in a gas giant. The issue at hand is what the Wikipedia article stated - as you go down through the atmosphere, you encounter denser and denser material. Gas under incredibly high pressure will start to behave like a liquid, and be as dense or denser than a liquid such as water. There would be no definite point at which you could say the stuff above you is clearly "air-like" while the stuff below you is clearly "water-like," it's a gradient.

You would also get crushed long before you made it anywhere near the core, just like it's only fairly recently that we've been able to build submersible vessels that can go to the deepest parts of the ocean on Earth.

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  • $\begingroup$ Even harder to combat than the pressures would be the temperatures. We can build some pretty sturdy submersibles but the temperatures inside gas giants surpass the melting points for every solid I'm aware of. $\endgroup$ – Asher Feb 15 '17 at 17:13

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