Ever wondered how we know all this?

This is what you see in this image:

1. Upper atmosphere, top clouds.
2. Atmosphere consisting of hydrogen, helium, and methane gas.
3. Mantle consisting of water, ammonia, and methane ices.
4. Core consisting of rock (silicates and nickel-iron).

I have taken this information straight from the source (link below).

I still can’t fathom sometimes, how on Earth – as it were – we know all of this. This is the inside of the outermost planet in the solar system. I mean, like, huh?!?!!

Image source

Image credits: FILNASA; Pbroks13 (redraw)