Impact! New Moon Craters Are Appearing Faster Than Thought - space.com
New craters are forming on the surface of the moon more frequently than scientists had predicted, a new study has found. The discovery raises concerns about future moon missions, which may face an increased risk of being hit by falling space rocks.
The moon is dotted with a vast number of craters, some billions of years old. Because the moon has no atmosphere, falling space rocks don't burn up like they do on Earth, which leaves the moon's surface vulnerable to a constant stream of cosmic impacts that gradually churn the top layer of material on its surface. You can see a before-and-after video of a new moon crater here.
An animation using two before and after images reveals the appearance of a new 39-foot-wide (12 meter) crater on the surface of the moon.
Credit: NASA/GSFC/Arizona State University