CARD IMAGE:
Io
Jupiter's innermost moon, Io, is roughly the size of Earth's moon, but 2,000 times farther away. The reddish, white, and black areas are probably surface deposits, possibly consisting of mixtures of salts, sulfur, and sublimate deposits. Many of the black spots are associated with craters of possible volcanic origin.
Courtesy NASA
To Whom It May Concern [at Pomegranate, who published the postcard book The Solar System.]:
This is an excellent series of postcards & I'm sure your others are as well. They are, however, hard to remove from the books without tearing.
Regards,
Dees Stribling
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