Roscosmos officials explained that a malfunctioning sensor led to an issue with the separation between the two rocket stages, causing one piece of the rocket to fail to separate fully, sending the rocket into a spin and prompting the instant abort.
Although the official report on the cause of a Soyuz rocket failure won't be released until Thursday, a Russian official disclosed its central conclusion a day early, the country's news agency TASS reports.
The launch date of the Soyuz MS-11 mission was revealed during a press conference held by Roscosmos, where they also disclosed the reason behind why their Soyuz MS-10 mission had to do an emergency landing on October 11 - causing the astronauts to carry out a ballistic re-entry back into Earth. The two men made an emergency landing in Kazakhstan, and were soon rescued.
Russian rockets are manufactured in Russia and then transported by rail to the Russia-leased Baikonur cosmodrome. Specifically, additional checks were introduced during preparation of the Soyuz 2.1B rocket, which was launched on October 25.
Last week, Russian Federation successfully launched a Soyuz rocket for the first time since the failure. More recently, Russia's space program has been dogged by a string of failed satellite launches involving unmanned vehicles.
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Russian officials believe that the defective component was damaged during assembly.
The incident, triggered by a mechanical failure, forced two astronauts to abandon ship shortly after launching from the Baikonur cosmodrome in Kazakhstan.
Roscosmos officials on Wednesday met with their counterparts from NASA to give them a full briefing on the malfunction, Roscosmos director general Dmitry Rogozin said Thursday. In fact, a Soyuz launch to carry cargo to the space station is scheduled for November 16 and a crewed launch set for December 3.
The current space station crew - NASA's Serena Aunon-Chancellor, Russian Sergei Prokopyev and German Alexander Gerst - was scheduled to return to Earth in December after a six-month mission but will have to stay there for at least an extra week or two to ensure a smooth carry-over before the new crew arrives in early December. Russian Federation stands to lose that monopoly with the arrival of SpaceX's Dragon and Boeing's Starliner crew capsules.