Moon and Ganymede in the Earth’s sky

Moon and Ganymede in the Earth's sky

The largest moon and also the largest non-planet in the Solar System, Ganymede has a mean radius of 2634.1±0.3 km (about 1636 miles, 0.413 Earths). For comparison, our Moon’s radius is 1,737.1 km (1079 mi). What if Ganymede was the Earth’s second moon? That’s how it would look in the sky if it was at the same distance as the Moon.

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