According to the space agency, the diameter of the 163348 (2002 NN4) asteroid is between 250 and 570 meters, and it will dash past our planet at a distance of 5.1 million kilometers with a speed of 11.1 km/s.
Currently, the astronomers have discovered over 8,000 asteroids of over 140 meters in diameter in the near-earth space, or within the radius of 7 million km. According to NASA experts, such celestial bodies are classified as "potentially dangerous." The total number of large asteroids in the near-earth space might reach 25,000, according to Space.com.
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