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Where Did The Moon Come From? - Do We Really Need the Moon? - Preview - BBC Two
Key Facts In This Video
The Barringer Crater in Arizona is a mile (1.6 km) in diameter, and was formed 50,000 years ago. 00:38
See what it may have looked like when a Mars-sized object collided with Earth: 01:19
When it first formed, the moon was made of molten material. 02:23