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. The cameras snap four pictures of the same spot in the sky over an hour, and then software reveals any telltale movement in those frames. So the surveys for rocks large and "small" are vital.
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