Russian Module Knocked International Space Station Out of Control for Almost an Hour


That all went exactly as it was supposed to, so it came as a shock to the astronauts and cosmonauts onboard the station when things started getting dramatic. Reuters reports NASA told journalists on Thursday that about three hours after Nauka docked onto the station, scientists in Moscow were completing some alignment checks, and the thrusters designed to get the module to lock onto the station mistakenly fired.

Obviously, there’s not a lot of resistance in the vacuum of space, so although Nauka’s thrusters aren’t particularly heavy-duty for a rocket, it was able to push the entire ISS about 45 degrees off-attitude. NASA explained to reporters that at the worst point, the ISS was twisting in its orbit by about half a degree per second, which doesn’t sound like very much until you’re being slowly flung through space by an out-of-control rocket that’s locked onto your ship.

In the end, the situation was resolved by using one of the ISS’s other modules’ thrusters to push back at Nauka and then correct the orbit once the misfire had been stopped. Everything was later righted and full communications had been restored—although scarily, NASA lost touch with the crew for several minutes twice during the incident. 

Roscosmos, who made the Nauka module and was in control of the systems that caused it to misfire, blamed the incident on a software failure. NASA was keen to emphasize that the crew of the ISS was never in any immediate danger.

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