Reddit's space forum is a wonderful little place for anyone with an interest in the extraterrestrial. But this little gem is perfect for trolling your space-loving buddies.
Posted today by user youreeka, the image shows nine stunning "planets" - but comes with the warning that all but one are actually photos of frying pans.
So, which one?
Go on, take a guess. We'll add this buffer zone and tell you the answer once you scroll down...
Well? Here's your answer:
... it's the one on the middle left, and is the moon Europa. It's the sixth-largest moon in our solar system - slightly smaller than our own.
The others, as we said, are frying pans. The image has been repurposed from photographer Christopher Jonassen's still-life study of frying pans, titled "Devour".
Eagle-eyed astronomy enthusiasts in the Reddit thread say that even without knowing what Europa looks like - the image used is one of the most famous of the moon - the long canyons should have given it away.