There are a lot of scientists who would like to know more about Jupiter. The major issue of this planet is the fact that there is not enough solid surface for the spacecraft to land. If in case a spacecraft would like to know more about it, then it would need to get as close as possible to it without actually landing.
The atmosphere of Jupiter is mostly composed of hydrogen and helium. The planet’s atmosphere and its interior are connected to each other and there is no divider. There is a lot of pressure inside Jupiter so even if some would try to enter, they will surely be crushed because of the obvious pressure.