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How fast was the planetesimal going in kilometers per hour when it collided with Earth?
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How fast was the planetesimal going in kilometers per hour when it collided with Earth?

User Chrisis
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Answer:it covers this route at a speed of nearly 30 kilometers per second, or 67,000 miles per hour. In addition, our solar system--Earth and all--whirls around the center

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User Atwalsh
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