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Between 4 billion years ago, the inner Solar System was in turmoil.
Debris from the planet-building process rained down on the inner planets
for a period spanning nearly 200 million years.
These scenes show the Earth and Moon during this time, known as the Late Heavy Bombardment.
However, there has been some debate recently as to whether or not this event, first postulated based on lunar samples returned during the Apollo missions, actually took place.
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