Pablo Santos-Sanz literally leapt into the air and gave a shriek of joy in his room at the Andalusian Astrophysics Institute in Granada. But then doubt set in immediately. Could it be true? Was it really possible that an astronomy student had discovered such a bright unknown object in the outer regions of the solar system? Shouldn’t it have been found by someone else long ago? Was it really an ice dwarf or was it an asteroid that was much closer but which, for some reason, hardly seemed to move across the sky? Pablo thought maybe he shouldn’t shout too soon.