What If You Released a Submarine Into Jupiter’s Atmosphere
The atmosphere of Jupiter essentially makes up the entire planet. The gas giant has no firm surface to touch down on. Instead, it is composed almost entirely of hydrogen and helium, with a few traces of other gases comprising a tiny percentage of its air.
Jupiter’s atmosphere is one of the key science targets for NASA’s Juno mission, which began orbiting the planet in 2016. The spacecraft is looking to measure the amount of water in the atmosphere, which should tell scientists whether their current ideas about how the solar system formed are correct.