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At the time of cold war military satellites monitored earth continuously for ballistic missile launches, nuclear tests and other kind of things. Those satellites detected also explosions in upper atmosphere, some of these weer even in class of hundreds kilotons.
Originally posted by onlyinmydreams
BTW, I've heard commentators on radio shows say that this particular asteroid would have exploded with the force of an atomic bomb if it entered the atmosphere. Does anyone have any idea where they are getting that from?