Most craters on the Moon are caused by high‑speed impacts from space rocks like asteroids, meteoroids, and comets smashing into its surface, with a smaller number formed by ancient volcanic activity. Because the Moon has almost no atmosphere or weather, those craters don’t erode away, so they accumulate and stay visible for billions of years.

Quick Scoop: Why the Moon Is So Cratered

  • Space rocks (asteroids, meteoroids, comet fragments) slam into the Moon at very high speeds, often faster than the speed of sound, carving out circular impact craters.
  • The Moon’s lack of atmosphere means incoming rocks don’t burn up like many do on Earth, so even tiny ones can make noticeable craters.
  • Each impact releases a burst of energy that excavates a hole, throws material outward (called ejecta), and can leave bright rays streaking away from the crater.
  • Larger impacts create complex craters with central peaks (a rebound “mountain” in the middle) and terraced walls, while small ones are simple bowl‑shaped pits.
  • In the distant past, volcanic eruptions on the Moon also created some crater‑like depressions and helped fill in huge impact basins with dark lava plains (the maria you see as darker patches).
  • On Earth, many impact craters are erased over time by weather, oceans, and plate tectonics, but the Moon is geologically quiet, so its crater “record” is preserved.

How an impact crater forms (step‑by‑step)

  1. A space rock approaches the Moon at extreme speed.
  2. On impact, its kinetic energy vaporizes or shatters both the rock and lunar surface, creating a shock wave.
  1. The surface is blasted outward and upward, excavating a round hole and flinging ejecta around it.
  1. The ground rebounds and slumps, sometimes forming a central peak and terraced edges in larger craters.

In short, when you look at the Moon’s craters, you’re seeing a frozen history of billions of years of cosmic collisions that Earth largely hides under air, water, and moving crust.

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Discover what causes craters on the Moon: high‑speed impacts from asteroids, meteoroids, and comets, plus ancient volcanism, and why these scars endure as a record of solar system history.

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