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Callisto, Jupiter's moon-Spectacular! According to NASA, it has the darkest surface of the four Galilean moons, but is twice as bright as our moon :) It is also the most heavily cratered object in the entire solar system!

from Cognitive Surplus

Astronomy Vintage XL Journal

• • • • • Gift Option • • • • • Add A Gift Bag for $3.95 This Astronomy sketchbook is emblazed with vintage illustrations of the “Visible Heavens.” Everywhere you look, the sky is spangled with stars

from WIRED

The Solar System’s Most Spectacular Geology Revealed by 50 Years of Robotic Exploration