“Look again at that dot. That’s here. That’s home. That’s us.” — Carl Sagan, "Pale Blue Dot," 1994⁣⁣ ⁣⁣ Our Voyager 1 spacecraft took this iconic image of Earth 35 years ago. Voyager 1 was so far away — 3.7 billion miles (6 billion km) — from the Sun that, from its vantage point, Earth was just a point of light about a pixel in size. Truly a “Pale Blue Dot.”⁣⁣ ⁣⁣ Mission managers commanded the spacecraft to look back toward home for a final time. It snapped a series of 60 images that were used to create the first “family portrait” of our solar system.⁣⁣ ⁣⁣ Carl Sagan was a prominent planetary scientist who was a consultant and adviser to NASA beginning in the 1950s. He also was a member of the Voyager Imaging Team. He had the original idea in 1981 to use the cameras on one of the two Voyager spacecraft to image Earth. He realized that because the spacecraft were so far away the images might not show much. This was precisely why Sagan and other members of the Voyager team felt the imag...