Jupiter & its four planet-size moons, called the Galilean satellites, were photographed by Voyager 1. Reddish Io (upper left) is nearest Jupiter; Europa (center); Ganymede & Callisto (lower right). These are photographed in early March of 1998. via /r/spaceporn https://ift.tt/32Nv4bb
via Tumblr https://ift.tt/2Q9BPm8
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