On July 9, 1979, Voyager 2 made its closest approach to Jupiter and snapped this photo of the largest planet in our solar system with its moon Io orbiting beside it. Like all the Voyager closeups of our solar system's planets, it is startling to see other planets have all the reality that our own does when seen by instruments we've created.
But of all the images of Jupiter I've ever seen from Voyager, the one below, actually captured by Voyager 1, is the best. This is the image I see in my head when I think, "alien planet."
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Alexis C. Madrigal is a staff writer at The Atlantic and the author of Powering the Dream: The History and Promise of Green Technology.