Meteor Crater is one of the youngest and best-preserved impact craters on Earth. The crater formed roughly 50,000 years ago when a 30-metre-wide, iron-rich meteor weighing 100,000 tons struck the Arizona desert at an estimated 20 kilometres per second. The resulting explosion exceeded the combined force of today's nuclear arsenals and created a 1.1-kilometre-wide, 200-metre-deep crater.
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| Picture: NASA |
