On Valentine's Day 1990, NASA's Voyager 1 spacecraft snapped what would become one of the most iconic images ever taken: a view of Earth from 3.7 billion miles (6 billion kilometers) away. In that moment, all of humanity was captured in a ghostly fragment of a pixel swimming through an unrelenting sea of darkness — a "Pale Blue Dot" lost in a void.
Carl Sagan — the astronomer, author, and science communicator best known for the award-winning TV series "Cosmos: A Personal Voyage" — is one of the reasons this picture exists.
