Space
A single meteorite smashed into Mars and created 2 billion craters
The debris from the formation of a relatively small crater on Mars created billions of additional craters, which could help us learn about Martian geology
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The debris from the formation of a relatively small crater on Mars created billions of additional craters, which could help us learn about Martian geology
Mars is generally thought of as being geologically dead, but a huge marsquake measured by NASA's InSight lander suggests otherwise