After you beat the game, there are purple comets for each level whereby you have to collect 100 purple coins to get the star for that level. In Deep Dark Galaxy, there's two purple coins under the crow's nest of the ship. One is easily accessible by jumping off the red pole, but I can't figure out a way to get the one that's further back.
How do you get this purple coin?
Best Answer
This GameFAQs guide shows you how to complete all of the comet challenges. I think this is the part you are looking for: