A rock the size of a city block falls toward Earth at 20 kilometres per second. ðŸŒ
You see a streak of light brighter than the sun. Then the air catches fire. The explosion releases 50 megatons of energy. Everything within 5 kilometres is vaporised instantly. The shockwave shatters glass 50 kilometres away. In 2013, a 20-metre rock injured 1,500 people in Russia and shattered windows across 7,200 square kilometres. That was 30 times Hiroshima. A city-block-sized object would be 2,500 times that. Dust and debris block the sun. Temperatures drop. Crops fail for years. The city is just the beginning. We track less than 40 percent of all city-killer-sized objects in our solar system. The next one could arrive without any warning.
Would you want to know 24 hours before impact? 👇
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