'it’s not a matter of whether the Earth will be hit again. It’s a matter of when,' writes Don Lincoln | Opinion
Editor’s Note: Don Lincoln is a senior scientist at the Fermi National Accelerator Laboratory. He is the author of several science books for general audiences, including the best-selling audio book “The Theory of Everything: The Quest to Explain All Reality.” He also produces a series of science education videos. Follow him on Facebook. The opinions expressed in this commentary are solely his. View more opinion on CNN.
Over 50,000 years ago, a rock 150 feet across and weighing several hundred thousand tons smashed into the Arizona desert with the power of over 150 times the bomb that devastated Hiroshima and left a crater almost a mile across that is still visible today. In 1908, a meteor impacted the Earth’s atmosphere near Tunguska, Siberia. The energy from the event was equivalent to 10 to 15 megatons of TNT.
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