Our last day? Asteroid may hit Earth on April 13, 2029

More than 100,000 asteroids hurtle past our planet. But only one–that we know of–may hit us in the next 30 years. Friday the 13th of April 2029 could be a very unlucky day for planet Earth. At 4:36 am Greenwich Mean Time, a 25-million-ton, 820-ft.-wide asteroid called 99942 Apophis will slice across the orbit of the moon and barrel toward Earth at more than 28,000 mph. The huge pockmarked rock, two-thirds the size of Devils Tower in Wyoming, will pack the energy of 65,000 Hiroshima bombs — enough to wipe out a small country or kick up an 800-ft. tsunami.

On this day, however, Apophis is not expected to live up to its namesake, the ancient Egyptian god of darkness and destruction. Scientists are 99.7 percent certain it will pass at a distance of 18,800 to 20,800 miles. In astronomical terms, 20,000 miles is a mere stone’s throw, shorter than a round-trip flight from New York to Melbourne, Australia, and well inside the orbits of Earth’s many geosynchronous communications satellites. For a couple of hours after dusk, people in Europe, Africa and western Asia will see what looks like a medium-bright star creeping westward through the constellation of Cancer, making Apophis the first asteroid in human history to be clearly visible to the naked eye. And then it will be gone, having vanished into the dark vastness of space. We will have dodged a cosmic bullet.

Maybe. Scientists calculate that if Apophis passes at a distance of exactly 18,893 miles, it will go through a “gravitational keyhole.” This small region in space — only about a half mile wide, or twice the diameter of the asteroid itself — is where Earth’s gravity would perturb Apophis in just the wrong way, causing it to enter an orbit seven-sixths as long as Earth’s. In other words, the planet will be squarely in the crosshairs for a potentially catastrophic asteroid impact precisely seven years later, on April 13, 2036.

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