Voyager 1 has spent decades in space sending back images of Jupiter and Saturn, including the classic Pale Blue Dot image of the entire solar system, before the spacecraft’s cameras were shut down to save power. But before all of that they had to be tested.

So two weeks after launch, on September 18, 1977, Voyager 1 looked back from a distance of 11.6 million kilometers and took a picture showing both the Earth and the Moon. The three-filter composite was shot to properly expose the Earth. The Moon was brightened in post-processing so both would be visible.

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Crescent Earth and Moon (NASA JPL)