Astronomers witnessed planets colliding 11,000 light-years away, an event that could shed light on the collision that created Earth's moon.
A 4.5-billion-year-old meteorite crashes through the roof of a house in Georgia, revealing clues about the origin of the Solar System.
Oxygen isotope analysis of lunar soil shows meteorites delivered only a limited amount of water to the Earth–Moon system after about 4 billion years ago.
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