65438+1October 10 An asteroid will pass the earth dangerously. According to the results confirmed by NASA's asteroid tracker, NASA believes that an asteroid is "potentially dangerous" and may suddenly approach the Earth this week. It is estimated that the width of this asteroid is more than 65,438+0,800 feet (550 meters), which is larger than the height of the Willis Group Building in Chicago. NASA predicts that this meteorite from space will pass by the earth a few minutes before midnight on Friday, June+10/October 10, 65438. When this happens, NASA believes that this meteorite will have a "close contact" with the earth. The name of this asteroid is 20 19UO, and the NASA tracker confirmed the orbit of the meteorite at 20 19 and 10. Since then, NASA has been calculating the size, speed and orbit of asteroids to determine whether it may pose a threat to the earth. Because of its huge size and close distance to the Earth, NASA astronomers think that 20 19UO is a "potentially dangerous asteroid", or PHA for short. According to NASA, the width of PHA is usually greater than or equal to 150 meters (500 feet), which is equivalent to the height of two Statues of Liberty. Nasa once again stressed: "potentially dangerous comets are often unexpectedly close to the earth." "If the orbits of these objects pose a threat to the earth, only when we know their volume, shape, mass and composition can we come up with the best way to interfere with their orbits." Asteroids and comets are unlikely to hit the earth, but the gravity of other celestial bodies in the solar system may make them move slightly to the orbit connected with the earth. Nasa says that even if the initial overflight is not destructive, it may still lead to future collisions.
Near-Earth asteroid (NEAs) refers to an asteroid whose orbit intersects with the Earth's orbit. Such an asteroid may bring the danger of hitting the earth. At the same time, they are also celestial bodies that are relatively easy to detect with detectors. In fact, visiting some near-earth asteroids requires less propellant than visiting the moon. Rendezvous-Shoemaker of NASA has visited Eros, and Hayabusa of Japan has successfully landed in Kagawa, and has now returned and brought back material samples.
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