Roy's Postcards: 1986/12/15
Jupiter and its four planet-size moons, called the Galilean satellites, were photographed in early March 1979 by Voyager 1 and assembled into this collage. They are not to scale, but are in their relative positions. Reddish Io (upper left) is nearest Jupiter; then Europa (center); Ganymede and Callisto (lower right). Nine other much smaller satellites circle Jupiter, one inside Io's orbit and the others millions of miles from the planet. Not visible is Jupiter's faint ring of particles, seen for the first time by Voyager 1. The Voyager Project is managed for NASA's Office of Space Science by the Jet Propulsion Laboratory of the California Institute of Technology.
A postcard I picked out myself, since the date is in my handwriting. Jupiter has been important to me personally since my kindergarten teacher showed us a poster of the solar system, and that's probably why I chose a postcard of it.
See also: space
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