I always wondered if you could, in theory, travel through Jupiter. I guess the ultimate conclusion I reach is that the immense pressures means the idea of a gas in the conventional sense is redundant, that even if it's technically a gas, it's going to behave like a solid. We can turn a gas into a liquid and keep it like that using a thin layer of metal to contain the pressure. I can't even begin to imagine what the gravity and pressure forces inside Jupiter can do.