How scientists find the big asteroids that can threaten Earth
Mashable VR
MAY 21, 2022
Crucially, even a smaller asteroid, some 100 to 170 feet across, could destroy a place like Kansas City , home to half a million people. Just twelve hours later it exploded in the sky near Puerto Rico. So the surveys for rocks large and "small" are vital. NASA, however, has still never issued such a warning.
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