The asteroid “2021 UA1” flew over the Earth on the 23rd and became the third closest-earth asteroid in the history of observation. (Image/pixabay)
The asteroid “2021 UA1”, about 2 meters in diameter, flew over the Earth on the 23rd. At that time, it was only 3000 kilometers away from the Earth. It was the third closest asteroid to the Earth in the history of observation. Experts don’t know at all, it was not until the asteroid flew over the earth that the experts became alert.
According to comprehensive foreign media reports, NASA recently stated that the asteroid “2021 UA1” flew over the Earth on the 23rd. It had passed over Antarctica at that time and was only 3,000 kilometers away from the Earth, making it the third closest to the Earth in the current observation history. Of asteroids. According to the record, the current closest to the earth is the “2020 VT4” that wiped the surface of the earth on November 14, 2020. It was only 370 kilometers away from the earth at that time, and the second was the “2020 VT4″ that flew over the Vietnamese hemisphere on August 16, 2020. QG” was 2,940 kilometers away from the earth at that time.
It is worth mentioning that although the “2021 UA1” is very small, even if it actually hits the earth, there is a high probability that it will be burned out in the atmosphere. But it wasn’t until the “2021 UA1” flew past that the experts on earth discovered the existence of “2021 UA1”.
After the analysis, the experts found that the “observation blind spot” was accidentally discovered, because most of the asteroids observed by most astronomical institutions on the earth are in the front and flying in the direction of “facing the sun”, but “2021 UA1” is a small number from the back. , “Back to the sun, flying to the earth” flight direction, this way of flight will be blocked by the sun’s glare, so it is usually difficult to observe. In fact, like Mercury and Venus, they are also difficult to observe due to the glare of the sun, and they must be easily observed until dusk.
Because of this, in order to solve the observing blind spots from the back of the earth, NASA is currently building a new type of space telescope “NEO”, which is expected to be launched into the orbit between the earth and the sun in 2026. The report pointed out that this telescope can be found Near-Earth asteroids whose orbits intersect the Earth’s orbit by approximately 90%.
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