NASA's Voyager 2 spacecraft captured these views of Uranus (L) and Neptune (R) during its flybys of the planets in the 1980s.
Mandatory Credit: NASA/JPL-Caltech/B. Jónsson
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Telescopes reveal why Neptune is more blue than Uranus
Neptune and Uranus are so similar that scientists sometimes refer to the distant, icy planets as planetary twins. But these ice giants have one big difference: their color.
