Spore or Spore: Galactic Adventures?

Isn't Galactic Adventures an expansion? If I remember well, the gameplay additions of Galactic Adventures only begin when you reach the space age of your species, so I think if you own the expansion, you will end up playing it.

I came here to pretty much state what heilurmes posted above

bump

I played and liked Spore :3

The early game is very simple. you might want to get the version with the expansion

If I want to play the expansion do I have to download both?