Apparently the new feature in the expansion has proven to be popular. According to a new press release from EA, over 100,000 new adventures have been added to the Sporepedia since the expansion's release in mid-June. That number includes 10 new adventures created by the writers of the Robot Chicken TV show on Adult Swim. As you can see from the above screenshot, their new missions are certainly . . . different.
[Via email press release]
Gallery: Spore Galactic Adventures