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Planetary Geology

How planetary scientists know so much about places they have never visited.

The solar system has gotten a lot more interesting since we started launching robots to explore planets, moons, asteroids, and comets. Scientists have come to understand other planets in literally unbelievable detail. Here is an introduction to how they figured it all out.

Geologic Map of Mars

Geologic Map of Mars (NASA)

It is amazing that geologists can map a world without ever going there!