What's on Rockhopper's ship?

Take a look in the telescope, and you should see that Rockhopper is coming! However, what is that on his ship?!?! Looks like a big surprise! I cant wait, because whenever something is on Rockhopper's ship something really cool happens! Here is a picture of him in the telescope:
Here is a zoomed in view.. I wonder what that is?
Hmm... Could it be a forest? maybe he found another planet? Is that a cloud? Or maybe is it another ship? What do you think?
-Tiny Tim77