You continue to progress until you reach the Space Stage. (If you have beat the Cell Stage you can start a new game and go automatically to the Space Stage.) Once you are in the Space Stage and have your UFO, zoom out with your mouse wheel and you will be in orbit of your planet.
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To get More planets on Spore, you can either:put a settlement on an uknowned planetattack a Space stage alien planetor with a trade route, you can wait until the alien in the planet you have a trade route with wants to sell his planet to you for millions (i don't advise this because it's really expensive)
No Spore is a PC game
Spore GA is an add-on for spore. It is the same game, but it has a separate desktop icon.
You don't have to it's automatic.
The full game of spore is only available on PC and mac, sorry.