What can craters on the moon tell us about our planet's past?
To better understand how Earth evolved, scientists are pointing cameras toward impact craters on the moon. Impact craters are giant surface depressions that form in the aftermath of collisions by asteroids, meteoroids and comets. Exposure to wind, water and geologic activity slowly degrades impact craters found on Earth. But by knowing how a crater has changed over time, scientists can piece together clues of what conditions were like on the planet long ago. Now, NASA’s Lunar Reconnaissance Orbiter spacecraft is collecting images of impact craters on the moon’s surface. Unlike on Earth, these craters aren’t prone to weathering because the moon has practically no atmosphere. As a result, some have remained untouched since the day they were born. Scientists will use the images to determine how natural disasters and the climates of Earth’s past have shaped how its craters look today. Watch the video to learn more.