Andy Cheng has seen it all. The scientist from Johns Hopkins’ Applied Physics Lab has worked on the Galileo mission to Jupiter, the Cassini mission to Saturn, the NEAR mission to asteroid 433 Eros and many others during his decades-long career. Alien vistas are old hat to him.

But even he was amazed when he laid eyes on this photo of Io’s Tvashtar volcano, taken Feb. 28th by the New Horizons spacecraft: