Terrestrial planets like Earth/Mars/etc. are like tennis balls, with a solid surface over which we can walk. The atmosphere is like a blanket of gasses that surround it and is kept there by the gravity of the planet. These gasses are the sorts we breathe every day (like oxygen) and, compared to the size of the planet, terrestrial atmospheres are usually rather thin (kind of like the fuzz that surrounds the tennis ball).
Gas giants like Jupiter/Saturn/etc., are atmospheres basically all the way down. They don’t have a solid surface for you to walk on, and if you tried, you’d just keep falling deeper into the gasses. But interestingly, because these atmospheres are so thick and condensed by the planet’s gravity, as you went deeper you might notice that rather than falling through gas it would almost feel like you’re falling through liquid. Compared to the freezing temperatures at the edge of the atmosphere, the farther a human fell, the more they’d be crushed by the high pressure or burn up entirely. Eventually, the atmosphere gets so hot that it becomes plasma (kind of like superheated gas).
In short, I wouldn’t recommend trying to step foot on a gas giant unless you had some very special technology! Stick to Earth for now <3
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