ELI5 Jupiter - can you land on a gas planet?

What do they mean when they say Jupiter is a "gas" planet? Could a rocket be shot through it? Can a space ship land on it? If Jupiter’s Great Red Spot is a storm, why has it been there for so long? Why was the Juno mission one of NASA’s most difficult? ... we explain like I'm five Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: simonowens, billandteds69 and spriddler To the ELI5 community that has supported us so far, thanks for all your feedback and comments. Send us an e-mail: [email protected]