An enormous number of near-Earth asteroids (NEAs) orbit around the sun, and among them, 2,072 NEAs are recorded in the Minor Planet Center (MPC) database as potential hazardous near-Earth asteroids (PHAs). These PHAs frequently make close approaches to Earth’s orbit, and therefore, the hazard caused by PHAs is still a very real and ever-present threat. Faced with potential threats of PHA impacts, asteroid defense has been discussed with growing interest. Monitoring for and early warning about those PHAs is the premise of planetary defense.
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Source: Phys.org