From Scientific American:

10 kilometers

Estimated diameter of the Chicxulub impactor, which struck modern-day Mexico approximately 66 million years ago and contributed to the demise of the dinosaurs.

10 kilometers

Estimated diameter of the asteroid that formed South Africa’s Vredefort Crater, the largest confirmed crater on Earth’s surface.

250 kilometers

Newly estimated diameter of the asteroid that created the moon’s Imbrium Basin.

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