More than 65 million years ago, a huge asteroid plummeted to Earth, destroying nearly all life on the planet. Astronomers now know that large asteroids collide with the Earth every 500 years or so. They�ve even identified one that�s likely to come close to Earth on April 13, 2029, and may return to hit us 7 years later. What can we do to prevent this calamity? Watch Asteroid Hunters on iTunes U and find out.
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[Source: Apple Hot News]
