Scientists found a secret in old Voyager 2 data. This is why we need to revisit Uranus and Neptune

Photos: Voyager 2 captures planetary portraits
NASA's Voyager 2 spacecraft visited Uranus (left) in 1986 and Neptune (right) in 1989.
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Photos: Voyager 2 captures planetary portraits
Voyager 2 launched on August 20, 1977. Retrace the steps of its journey across our solar system through some of its most iconic images.
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