A space rock calculated to be as wide as a two story building is tall which exploded with the equivalent of 13,000 tons of TNT entering Earth’s atmosphere was missed by NASA on February 6th. Completely.
This is despite the fact that NASA has a whole entire program specifically dedicated to spotting potentially dangerous space rocks entering the Earth’s atmosphere.
NASA made the announcement after the fact, but the agency was itself informed of the event by another agency, which many have speculated is the military. (Other guesses are the NSA, which spies on everything everywhere, including space.)