Salyut 7’s debris strike

Salyut 7A small object hits one of the windows aboard the Soviet Union’s Salyut 7 space station, leaving a noticeable dent on its exterior layer but not causing enough damage to vent the station’s atmosphere into space (luckily for resident cosmonauts Vladimir Lyakhov and Aleksandr Aleksandrov, who might have to evacuate in their Soyuz T-9 vehicle in such an emergency). Though speculations include a micrometeoroid or wayward debris from a previous space mission, the exact cause of the impact is never confirmed.