Scientists revealed an asteroid dubbed by some as a “city killer” came closer to the Earth than the moon this week. Asteroid 2019 OK came hurtling toward Earth at a speed of nearly 15 miles a second, before flying past. Astronomers say it posed no immediate threat but they admit they had no idea the giant rock was headed our way, because it came from the direction of the sun. At a conference in April, scientists from around the world were asked how to respond to a make-believe scenario in which an asteroid big enough to destroy a major city might be on track to strike the Earth in eight years. The likely response would be using space ships to give the asteroid a nudge, one scientist said.
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