Callisto may not make headlines like Io or Europa, but its beauty is unmatched. See this mysterious moon as you’ve never seen it before with these stunning high-resolution images. Dive into the ...

Sixty-seven orbits of Jupiter. Two close-ups of its moon Europa—where astrobiologists think microbial life may exist—21 flybys of far-out Callisto, and nine months in orbit around the biggest ...