Where Volcanoes Snow:
A probe sweeps through space. Roughly 4.5 million kilometers (2.6 million miles) away, you sit and watch images of another world appear. You notice a mottled surface, and on its horizon, jetting an incredible 260km (162mi) above its surface, a plume.
This photo was taken by Voyager 1 looking back 2.6 million miles (4.5 million km) at Io, three days after its historic encounter. This is the same image in which Linda A. Morabito, a Jet Propulsion Laboratory engineer, discovered the first extraterrestrial volcanic eruption (the bright curved volcanic cloud on the limb). Image courtesy NASA/JPL.
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