It’s not a question of if but when: Eventually, astronomers will discover a celestial object on an Earth-bound trajectory. It might be an asteroid–a big chunk of rock, orbiting the sun in the inner part of the solar system–or it might be a comet, containing ice as well as rock, and typically moving in a slower, more oval-shaped orbit. To be very clear, no asteroids or comets are currently known to present any danger. Nonetheless, it pays to be prepared, given the devastation that such an impact would bring.
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