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Why is Jupiter’s ring system difficult to see from Earth?

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photo of Jupiter taken by Voyager 1 — Jupiter Photograph of Jupiter taken by Voyager 1 on February 1, 1979, at a range of 32.7 million km (20.3 million miles). Prominent are the planet's pastel-shaded cloud bands and Great Red Spot (lower centre).

Jupiter’s ring system is difficult to observe from Earth because the particles that compose it are primarily very small, micrometre-sized grains. These particles scatter light much more effectively in the forward direction—away from the Sun—than they do in the reverse direction toward Earth.

Because of this optical property, the rings appear significantly brighter only when viewed from behind the planet, looking toward the Sun, as was done by the Voyager spacecraft. When observed from Earth, which is positioned on the same side of the planet as the Sun, the rings do not reflect enough light to be easily detected, which is why they remained undiscovered until the late 20th century.1