The US Space Force detected the breakup on Sept. 13th when USA 32 unexpectedly shed a cloud of debris 775 km above Earth. The number of fragments is still unknown; Space-Track, the Space Force's public catalog, has not yet released a count.

There may be nothing sinister about this event. Old spacecraft carry batteries and leftover propellant. After 38 years of heating and cooling, a pressurized tank or a battery cell on USA 32 may have simply ruptured. This is a leading suspicion, although it is too soon to rule out a meteor strike or ASAT.

Other satellites may be in danger. USA 32 broke up in a crowded shell of low Earth orbit. Within 50 km of its altitude are more than 200 active satellites, including the entire Iridium NEXT constellation. Even before USA 32 broke up, this region was extremely cluttered. NASA identifies a major debris-density peak already there from the Iridium 33/Cosmos 2251 collision in 2009. The collision threat is real.

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