Teacher resources and professional development across the curriculum
Teacher professional development and classroom resources across the curriculum
Learner Express: Modules for Teaching and Learning
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Collisions are one of the most important processes in the solar system. A massive collision between a Mars-sized planet and the newly-formed Earth might have led to the unique configuration of the Earth and Moon we see today. Craters provide evidence of past collisions.
Earth's active processes of erosion and plate tectonics help explain why craters on the Earth are less visible than on its nearest neighbor, the Moon. View Video
Scientists have proposed that the Moon was formed from a collision in the early solar system. View Video
Why do craters on the Moon have similar shapes? A planetary scientist uses a ball thrown into sand to illustrate the reason. View Video