"The majority of near-Earth objects have orbits that don't bring them very close to Earth, and therefore pose no risk of impact, but a small fraction of them - called potentially hazardous asteroids - require more attention."
"The majority of near-Earth objects have orbits that don't bring them very close to Earth, and therefore pose no risk of impact, but a small fraction of them - called potentially hazardous asteroids - require more attention."
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