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Video: NASA News: A Fairly Large Asteroid Has Grazed Our Planet
NASA news: appeared last June, the asteroid "2019 OK", or simply "OK", passed near our planet during the night of July 24 to 25, between 3:15 am and 3:30 am, while it was not had not been detected a day earlier by two telescopes in Hawaii! Indeed, this asteroid was discovered by NASA on June 28, but had since disappeared from its radars. So why was “2019 OK” spotted at the very last moment?
NASA news: an asteroid has grazed Earth and astronomers had not expected
Measuring between 40 and 130 meters in diameter, this space object passed 76,000 kilometers from Earth (or five times closer to us than the Moon) and gave scientists a cold sweat, just a day before grazing the sea. planet. The explanation for this late spotting? According to CNRS research director and asteroid specialist Patrick Michel, it is difficult to spot objects of such small size. Why ? Well, because they only reflect sunlight and don't emit their own light. What's more, asteroids move much faster than stars, as they pass closer to Earth, while leaving a very low light trail.
So, should we be worried? This is not the first time this has happened, and it will happen again. According to the American space agency, an asteroid 50 meters in diameter can do damage similar to that which was caused in 1908 in Siberia, in the forest of Tunguska. There will therefore be a strong explosion, which will pulverize about 2000 m² of forests.