Earth had a surprise visitor on Thursday and no welcome.
An asteroid big enough to get the nickname "city killer" from astronomers who passed close by, and that was not discovered soon enough. According to the Washington Post it was necessary to have one To take a defensive measure.
CNET compares Asteroid 2019's passport with "Baseball [whistle] on your ear". while you walk down the street. The asteroid is about 100 meters wide and came within a radius of 75,000 kilometers around the earth, a fifth of the distance to the moon.
At his next point he would have been visible with binoculars, writes the astronomer Michael Brown in conversation. "It crept in pretty quickly," Brown tells Post . "People only understand what happened after it happened to us."
Had the asteroid hit, it would have landed with the power of a large nuclear weapon or about 1
So, how did asteroid trackers almost miss it? First, its size. 2019 OK is big enough to cause great damage, but not as big as on a grand scale – nothing on the scale of the famous dinosaur killer. Yes, it could be seen binoculars in the next place, but "three days ago it was 1000 times weaker and therefore harder to spot," writes Brown.
It also has an "eccentric orbit," he says, adding that it's unlikely to come so close to Earth in the future. (Japan's space agency has just done a remarkable feat with another asteroid.)
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