Maybe this is a bit off topic, but, ASSUMING that this is a 'Choose Your Planet' screen...this could change a few things.
For instance. You start your first race and go through all of the stages up to space. You become very, very powerful. You save the game, exit back to this screen and then select a new planet fairly close to your first one. After you evolve your new creation up to the creature stage, you save and go back to the first race. Now, you jump in your ship and fly to your second race's planet. Once you locate some of them on the surface, drop monolith, BOOM! Instant brain-boost.
Just a random thought I had. Although, if it is like the Sims, anything you did to someone else's Sim in your game did not affect their game. Everything was just the way it was when they last saved it. So, likely, I'm just rambling on incessantly. Which, honestly, is no huge stretch.