I haven't checked to see if it is different with the patch, but in the original alpha release I'm pretty sure the planets in orbit can exceed 10 and when this is the case there is a scrollbar. Posting from my phone and away from my computer, otherwise I'd double check to be sure.
I just checked an older saved game. You are correct. When I was playing through the first time, I don't remember seeing the scroll bar.
But, I had an interesting glitch on the 0.0.2.0 patch. When I loaded the very last saved game, I could not advance the game passed turn 287 (research was finished). However, when I was playing through the first time, I was able to continue after research was done. Interesting.