The moon's hidden half is actually brighter than the side we see

Space · Published 23 October 2026 Swipe more like this →

In short: For centuries, humanity imagined a world of eternal shadow on the far side of the moon. But the truth is a matter of geometry, not light. This hidden hemisphere isn't shrouded in darkness; it is simply turned away from our view by a slow, gravitational trick.

The term 'dark side of the moon' is a persistent misnomer. In reality, the moon's far side receives just as much sunlight as the near side, blazing under the same sun over the course of a month. Because of tidal locking, the moon's orbital cycle around our planet equals its rotational time, making it invisible to us. This keeps one face permanently oriented toward us, while the other remains hidden by motion rather than shadow.

Our first glimpse of this hidden world came in October 1959, when the Soviet space probe Luna 3 successfully flew around the moon and returned the first photographs of the far side. These images revealed a landscape strikingly different from the face we know. While the near side is characterized by large, dark plains called maria—ancient lava flows that filled impact craters—the far side is predominantly covered by highlands and contains far fewer of these dark patches.

This geological disparity exists because the moon's surface was shaped by impacts. On the near side, ancient lava floods filled many of these basins, creating the dark maria. On the far side, those same ancient basins were not filled with lava, leaving them heavily cratered and bright. Because of these lava flows, the side we see from Earth actually appears darker than the far side. Additionally, the lunar body is quite dim, bouncing back merely 7% of the solar rays it receives.

The mystery of the far side also presented significant logistical hurdles for early exploration. For example, the Tsiolkovskiy crater on the far side was considered for the Apollo 17 mission, but was ultimately deemed too risky. Because the far side faces away from Earth, establishing communication with the lunar surface from our planet is significantly more challenging.

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