Inspired by a comment in another thread, I have often wondered whether the gas giants have anything that approaches a definable surface. I realize that they are gaseous, so obviously no hard surface. But what would it be like if you approached Jupiter or Saturn ? Would there be a gradual fuzzy gassy reduction in visibility over several hundred or thousands of miles, or would there be a specific point after which visibility would reduce to virtually zero and we would be immersed in a gassy or gaseous environment ? Thanks.