“The dark side of the Moon is always dark”

It's a common misunderstanding that one half of the Moon perpetually exists in shadow, often referred to as its "dark side." In reality, every part of the Moon experiences both daylight and nighttime, just like Earth. The misconception likely stems from the fact that we only ever see one face of the Moon from our planet. This phenomenon, known as tidal locking, means the Moon's rotation period matches its orbital period around Earth, keeping the same side constantly facing us.

Scientifically, the Moon is always illuminated by the Sun, except during lunar eclipses when Earth casts a shadow upon it. As the Moon orbits Earth, it also rotates on its own axis. This rotation ensures that the "far side," the hemisphere we never see, receives just as much sunlight over the course of a lunar month as the "near side" that is visible to us. Apollo astronauts, for instance, saw the far side fully illuminated by the Sun during their missions.

The term "dark side" is therefore a misnomer, better replaced by "far side." The persistent belief in a perpetually dark side is understandable given our limited vantage point from Earth. Since we never observe the far side directly, it's easy to assume it must be a place of eternal night, forever hidden from the Sun's rays. However, it's merely hidden from our view, not from the sun.