Home » The third closest in history!The asteroid flies over the earth in a thrilling manner but no one finds it | American Taiwan Daily

The third closest in history!The asteroid flies over the earth in a thrilling manner but no one finds it | American Taiwan Daily

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An asteroid about 2 meters in diameter and the size of a golf cart passed by “2021 UA1” on the 23rd. The closest distance to the Earth is only 3000 kilometers. The planet, and it was only discovered after it passed through the earth, which aroused the alarm of experts.

According to comprehensive foreign media reports, according to NASA data, “2021 UA1” passed the earth last Sunday and flew over Antarctica, only about 3,000 kilometers from the earth, making it the third known distance from the earth. Nearest non-impact asteroids are second only to “2020 QG” in August 2020 and “2020 VT4” in November of the same year.

Even if “2021 UA1” hits the earth, it is likely to burn out in the atmosphere and will not cause damage to the ground, but what makes experts even more alert is that “2021 UA1” is so close to the earth, but it passes by. No one before the earth noticed it.

Experts analyzed afterwards that most of the asteroids discovered on the earth by NASA and other agencies came from the “front”, that is, they came toward the sun. However, some asteroids approached from the “back” of the earth, that is, from the sun to the earth. The location is close. When these objects are close to the earth, they are difficult to find because of the glare of the sun. Usually the best observation time for these objects is at dusk. This is the case for all stars in the space between the earth and the sun, such as Mercury and Venus. .

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And “2021 UA1” came from “behind” the earth and became an observation blind spot. In order to eliminate this blind spot, NASA built a new type of space telescope called the Near-Earth Object (NEO) Observing Telescope, which is scheduled to be launched in 2026. The orbit between the earth and the sun allows it to better detect these near-Earth asteroids. It is estimated that this telescope can help the earth find about 90% of the near-Earth asteroids. Liberty Times 1030

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