A look back at everyone on Earth #OTD in 1977.

NASA's Voyager 1 took the first image of the Earth and Moon in the same frame 48 years ago today. The spacecraft, which began its mission two weeks earlier, captured this scene from 7.25 million miles (11.7 million km) away.

This photo of Earth, dubbed the Blue Marble, was taken by the Apollo 17 crew #OTD in 1972 as they traveled to the Moon.

It soon became one of the most widely-distributed photographs in history.