Recipe For the 300-Mile Wide Crater

66 million years ago, a space bomb ten kilometers, or six miles, wide raced through the atmosphere at 20 kilometers per second and landed on the Gulf of Mexico at an angle of 90 degrees. The result was a crater 180 kilometers, or 110 miles, wide.

In an alternate Earth, a ball of pure iron is due to slam into the Great Lakes region and create a crater 300 miles wide. What would be the needed size, speed and angle to create such a hole on Earth?

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Recipe For the 300-Mile Wide Crater

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