Unspecified U.S. government spacecraft have been detecting the fireballs generated when small asteroids hit Earth’s atmosphere for the past 20 years and apparently measuring the energy they generate as they burn up. NASA’s Near Earth Object (NEO) Program has released a map of the impacts that include representation of the energy released, citing "U.S. government sensors" as the source. Military early warning spacecraft such as the Defense Support Program (DSP) ...


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