TAKE 27 LTD / SCIENCE PHOTO LIBRARY TAKE 27 LTD / SCIENCE PHOTO LIBRARY
Near-Earth objects (NEOs). Computer artwork showing two asteroids orbiting very near the Earth's atmosphere, with the moon at upper left. NEOs are asteroids or comets whose orbits bring them in close proximity with the Earth. If the orbit of these objects intersects with that of the Earth they are at risk of colliding with the Earth. Any asteroid over 1 kilometre in diameter that impacted the Earth would cause catastrophic effects.
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