NASAのインスタグラム(nasa) - 2月2日 06時12分

This image taken Jan. 30 and received on Earth today by our Cassini spacecraft is of Saturn's moon Mimas. Less than 123 miles (198 km) in mean radius, crater-covered Mimas is the smallest and innermost of Saturn's major moons. It is not quite big enough to hold a round shape, so it is somewhat ovoid with dimensions of 129 x 122 x 119 (miles 207 x 197 x 191 km, respectively). Its low density suggests that it consists almost entirely of water ice, which is the only substance ever detected on Mimas. Most of the Mimas surface is saturated with impact craters ranging in size up to greater than 25 miles (40 km) in diameter.

Image Credit: NASA/JPL-Caltech/Space Science Institute

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