LONELY.

Loneliness can be measured in both distance and emotion—and the most extreme example comes from Apollo 11 astronaut Michael Collins, who spent about 48 minutes alone in lunar orbit on the far side of the Moon. As Collins circled the Moon’s side facing away from Earth, radio contact with Earth and with Neil Armstrong and Buzz Aldrin dropped out. In that window, he was effectively the most isolated human being ever, farther from any other humans than anyone has been since the beginning of mankind.

The episode of literal separation matters because it reframes loneliness as something physical, not just psychological. The Moon’s distance is often underestimated because common images shrink it for convenience. In reality, the Moon is far enough away that scientists can track its motion precisely using reflectors left on its surface. By firing lasers at those retroreflectors and timing how long the light takes to return, researchers calculate the Earth–Moon distance with high accuracy. One surprising long-term trend: the Moon is slowly spiraling away from Earth, increasing its distance by roughly 38 millimeters each year (about 1.5 inches).

That slow drift becomes part of a larger story about how far human-made objects can travel—and how loneliness can extend beyond a single person. Multiple man-made artifacts have been sent outward, and four of them have moved so far that they are no longer within the solar system. Voyager 1 is highlighted as the most distant human-made object from Earth. On board, NASA included a gold-plated record intended for any extraterrestrial discoverer, containing information about humanity. Among the many audio tracks, one selection stands out for its emotional target: “Dark Was the Night, Cold Was the Ground” by Blind Willie Johnson.

The choice is striking because the track is instrumental in a specific way—there are no lyrics, only humming—yet it was meant to communicate the feeling of loneliness to whoever might find it. The biography behind the song deepens the resonance. Blind Willie Johnson was not blind for his entire life; he was blinded as a child after lye was thrown in his face by his stepmother. Later, he died of malarial fever after his home burned down, leaving him with nowhere to live except wet newspaper. The result is a piece of human suffering carried across interstellar space, turning a personal hardship into a message meant to survive the distance.

In the end, loneliness is presented as a bridge between physics and meaning: a person cut off by the Moon’s far side, a satellite’s laser-measured distance, and a decades-old humming track traveling outward on Voyager 1—each one a different scale of separation, all pointing back to the same human emotion.