Map: asteroid belt

  The so-called "near-earth asteroids", which literally mean that their orbits are very close to earth, are special groups that deviate from the main ring.

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  Dangerous asteroid

  Asteroids with a diameter of more than 140 meters and a minimum distance of less than 0.05 astronomical units (about 7.4 million kilometers) from earth are considered to be at risk, according to the analysis.

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  According to the latest release on the website of the international center for asteroids, researchers have identified 1,640 "potential threats to near-earth asteroids" through global surveys.

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  Asteroid impact history

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  Sixty-five million years ago, the dinosaurs, the massive animals that ruled the earth for 150 million years, suddenly disappeared. According to the extinction of the dinosaurs, astronomers suspect there are two possible reasons: one is the supernova explosion, roughly 10 ^ 24 hydrogen bomb energy led to the extinction of the dinosaurs; The second was an asteroid impact. In 1978, an American astronomer, luis alvarez, speculated that an asteroid had struck Iceland with the energy of a billion billion tons of TNT, a collision so violent that .