 What didn't surprise Casey about Jupiter?
JUPITER'S JOKE By A. L. HALEY Casey Ritter, the guy who never turned down a dare, breathed a prayer to the gods of idiots and spacemen, and headed in toward the great red spot of terrible Jupiter. But—and this was the 'but' that was likely to deprive the System of my activities—even experimenting with them was illegal even if it needed to be done; also, I had promised not to rat on him before taking the job. And instead, blast me, if they didn't foul me with this trip to good old Jupiter. Jupiter was worse than the pen, a lot worse. Jupiter was a death sentence. "You've no doubt heard tales of the strange population of Jupiter," he said. Well, a cross between a scorpion and a grasshopper, to be accurate. "What were you trying to do, start a feud between us and Mars?" Those emeralds were in the inner shrine of the super-sacred, super-secret temple of the cavern-dwelling tribe of Killicuts on Mars—the real aborigines. My jaw must've been hanging down a foot, because I'd just been playing along with him, not really believing him, and now all of a sudden I somehow knew that he'd really lifted those emeralds.
 the aliens communicated by tapping
 the red coloring was plants  items could float in mid-air  the aliens could remove their eyeballs  the aliens communicated by tapping