You stand on dirt and you don’t know what a planet is yet, so you call the stuff you stand on earth.
A long time later people figure out what a planet is but at that point people have been around standing on earth for ages, so you call the planet earth.
You stand on dirt and you don’t know what a planet is yet, so you call the stuff you stand on earth.
A long time later people figure out what a planet is but at that point people have been around standing on earth for ages, so you call the planet earth.