system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How are planets made (because my 6 year old wants to know and I can't find any explanation that isn't too complex)

He also asked "how can we see the Milky Way Galaxy if we're in it"...which although I explained it, seemed rather astute to me.
gpt
When a lot of stuff floats around it tends to group up... as those groups form they get more and more attracted to eachother.

The more stuff there is the more gets attracted (gravety). Eventually there is so much stuff that the middle gets very hot! Everything there turns into this super dense ball. it keeps pulling more and more stuff in. This forms a melted layer where there isnt enough stuff on the out side to squish it solid.

Now you have this giant melty ball that has attracted all the stuff around it into it. After a long time it cools down. this becomes the ground. with the melty bit under neith that and the solid core in the middle.

Hope this helps. To go any further then this requires some evolutionary biology stuff.