On Earth, we’re used to seeing a crescent moon—so much so that we barely pay attention to it. But imagine seeing three crescent moons at the same time. This is what NASA’s Cassini spacecraft captured on March 25, 2015.
The rare image shows three of Saturn’s 62 moons: Titan (the largest ... Read More
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May2015
The surface of Rhea has been sculpted largely by impact cratering, each crater a reminder of a collision sometime in the moon's history. On more geologically active worlds like Earth, the craters would be erased by erosion, volcanoes or tectonics. But on quieter worlds like Rhea, the craters remain until ... Read More