Crack on moon

The Moon is the only celestial body on which humans have set foot. By measuring the age of lunar rocks and soil samples collected over years of exploration, it is about 4.

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Just as the moon's gravitational pull causes seas and lakes to rise and fall as tides on Earth, the Earth exerts tidal forces on the moon. Scientists have known this for a while, but now they've found that Earth's pull actually opens up faults on the moon. In , the spacecraft helped scientists discover that the moon is shrinking: High-resolution LRO images revealed 14 lobe-shaped fault scarps, or cliffs, which likely formed as the hot interior of the moon cooled and contracted, forcing the solid crust to buckle.

After more than six years in orbit and imaging nearly three-quarters of the moon's surface, LRO has detected more than 3, of these fault scarps. These cliffs are the most common tectonic feature on the moon, and are typically dozens of yards or meters high and less than about 6 miles 10 kilometers long. Previous research had suggested they were less than 50 million years old, and are likely still actively forming today.

New analysis of the lunar surface reveals that it's far more fractured than once thought. Since the moon formed 4. But the damage goes far deeper than that, with cracks extending to depths of 12 miles 20 kilometers , researchers recently reported.

Though the moon's craters have been well-documented, scientists previously knew little about the upper region of the moon's crust, the megaregolith, which sustained the bulk of the damage from space rock bombardment.

In the new study, computer simulations revealed that impacts from single objects could fragment the lunar crust into blocks about 3 feet 1 meter wide, opening surface cracks that extend for hundreds of kilometers.