When people look up at the moon on a clear night, it is natural to wonder how many trips to the moon have actually happened. The short answer is that there have been a handful of crewed missions and a larger number of robotic visits, but the full story is much more nuanced. Understanding the difference between flybys, orbits, and landings helps clarify what counts as a trip and why the number is not as simple as it might seem at first glance.
Defining What Counts as a Trip to the Moon
The first challenge in answering how many trips to the moon have occurred is defining what qualifies. A flyby, where a spacecraft simply passes the moon and continues on its trajectory, is very different from entering lunar orbit. Then there is the question of landing, whether crewed or robotic, which involves descending to the surface and often performing experiments or collecting samples. Some missions, like the Apollo flights, clearly count as full trips, while others, such as brief data-gathering passes, occupy a gray area. For this overview, a trip is considered any intentional journey that reaches the vicinity of the moon with a defined objective, whether that is a flyby, orbit, or landing.
Human Crewed Missions to the Moon
When focusing specifically on human spaceflight, the number of trips to the moon is relatively small and well documented. The United States Apollo program conducted a series of missions between 1968 and 1972 that remain the only time people have traveled beyond low Earth orbit. Some of these missions circled the moon without landing, while others placed astronauts on the surface for extended exploration. Each Apollo mission that left Earth orbit and interacted with the lunar system is generally counted as one trip, regardless of whether a landing occurred. No other country has yet repeated this level of deep space human travel, making these Apollo flights unique in history.
Apollo Missions That Reached Lunar Space
Apollo 8 was the first crewed mission to leave low Earth orbit, orbit the moon, and return safely to Earth, making it one clear trip to the moon. Apollo 10 performed a similar journey but descended to within miles of the surface without landing. Apollo 11, 12, 14, 15, 16, and 17 all traveled to the moon and landed, with Apollo 13 completing a trip that was dramatically altered by an in-flight emergency. In total, there were seven crewed Apollo spacecraft launched toward the moon, with all but Apollo 13 completing their journeys. This means there were seven major human-led trips to the moon during the Apollo era, though not all resulted in a lunar landing.
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