Russian Soyuz rocket suffers rare last-minute abort during launch of 3 astronauts to ISS (video)

Update for 1 p.m. ET: The abort of today's Soyuz launch may have been due to a dead battery. "The reason has been identified, we just discovered at a meeting of the state commission that the reason was a voltage drop in the chemical current source," Roscosmos General Director Yuri Borisov said in a statement posted to the Russian space agency's Telegram account today.

A Russian Soyuz rocket carrying three astronauts bound for the International Space Station experienced a rare abort on the launch pad on Thursday (March 21) while the crew waited expectantly inside their spacecraft.

The abort occurred just 21 seconds before the Soyuz rocket was to launch NASA astronaut Tracy Caldwell Dyson, Russian cosmonaut Oleg Novitskiy and spaceflight participant Marina Vasilevskaya of Belarus to the International Space Station (ISS) from Baikonur Cosmodrome in Kazakhstan. Liftoff was scheduled for 9:21 a.m. EDT (1321 GMT). 

"The Soyuz launch to the space station has been aborted," NASA spokesperson Rob Navias said during live commentary. "So, no visitors to the International Space Station today. The next opportunity to launch, pending resolution of what happened today, would be Saturday morning," he added.

Related: International Space Station — Everything you need to know

A Russian Soyuz rocket carrying the three Soyuz MS-25 astronauts of Expedition 71 is seen on the launch pad on March 21, 2024, ahead of a last-minute abort that occurred at Baikonur Cosmodrome in Kazakhstan. (Image credit: NASA TV)

Navias said the abort was triggered by an automatic system shortly before engine ignition; two umbilical connections were retracted away from the rocket ahead of the planned launch. Roscosmos, Russia's space agency, sent engineers to the launch pad shortly after the abort to make sure the vehicle was safe and crew could be extracted.

"The vehicle is safe, all fueling operations have ceased," Navias said. "All safety commands have been provided onboard the rocket so there's no danger to the crew. They're perfectly safe."

NASA's Mission Control center radioed news of the launch abort to astronauts aboard the ISS shortly after it occurred. Flight controllers made it clear the Soyuz crew was safe.

"Station copies; aborted," station commander Andreas Mogensen of the European Space Agency replied. "Most importantly, Station copies crew are safe."

The Soyuz MS-25 crew waves farewell before an attempted launch to the International Space Station on a Soyuz rocket at Baikonur Cosmodrome, Kazakhstan. They are: Marina Vasilevskaya of Belarus (top), Tracey Caldwell Dyson of NASA (center) and Russian cosmonaut Oleg Novitskiy. (Image credit: NASA TV)

Russia's Soyuz rockets and crewed Soyuz spacecraft are workhorse transport vehicles that regularly fly cosmonauts and astronauts to and from the ISS. Roscosmos has used the spacecraft for crewed flights throughout the 24-year history of the ISS, as well as during its previous Mir space station program. 

An abort just before launch is exceedingly rare for Soyuz rockets. In October 2018, a Soyuz rocket carrying NASA astronaut Nick Hague and cosmonaut Alexey Ovchinin suffered an in-flight abort that forced the crew's Soyuz capsule to rip free from its rocket and make a harrowing emergency landing. That abort was traced to a deformed sensor on the Soyuz rocket.

Dyson, Novitskiy and Vasilevskaya are set to launch on a mission to join the ongoing crew on the International Space Station. Dyson and Novitskiy plan to spend six months aboard the space station as part of its Expedition 71 crew, while Vasilevskaya is set to embark on a 12-day stay and return home with the outgoing Expedition 70 crew. 

NASA astronaut Tracy C. Dyson (left), Roscosmos cosmonaut Oleg Novitskiy (center), and spaceflight participant Marina Vasilevskaya (right) of Belarus pose for a portrait at the Gagarin Cosmonaut Training Center on Nov. 2, 2023. (Image credit: GCTC/Andrey Shelepin)

Exactly when the three space travelers will launch, however, is unclear. While Roscosmos has said the next window to launch the trio will open on Saturday, engineers with Soyuz rocket maker Energia will have to understand why today's Soyuz launch aborted and perform any fixes that may be required. NASA has pledged to share updates as they are received from Roscosmos and Energia. 

Meanwhile, in Florida, another rocket is counting down to launch to the ISS today.

An uncrewed SpaceX Falcon 9 rocket and Dragon cargo ship are scheduled to launch more than 2 tons of fresh supplies to the ISS from Space Launch Complex 40 at the Cape Canaveral Space Force Station in Florida. Liftoff for that mission is scheduled for 4:55 p.m. EDT (2055 GMT) and should continue as planned, Navias said. 

"The preliminary word is that the Falcon 9 launch of the CRS-30 resupply mission to the station will likely proceed as planned today," he added. 

NASA and SpaceX will provide a livestream of the CRS-30 cargo launch, beginning at 4:35 p.m. EDT (2035 GMT).

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Tariq Malik

Tariq is the Editor-in-Chief of and joined the team in 2001, first as an intern and staff writer, and later as an editor. He covers human spaceflight, exploration and space science, as well as skywatching and entertainment. He became's Managing Editor in 2009 and Editor-in-Chief in 2019. Before joining, Tariq was a staff reporter for The Los Angeles Times covering education and city beats in La Habra, Fullerton and Huntington Beach. In October 2022, Tariq received the Harry Kolcum Award for excellence in space reporting from the National Space Club Florida Committee. He is also an Eagle Scout (yes, he has the Space Exploration merit badge) and went to Space Camp four times as a kid and a fifth time as an adult. He has journalism degrees from the University of Southern California and New York University. You can find Tariq at and as the co-host to the This Week In Space podcast with space historian Rod Pyle on the TWiT network. To see his latest project, you can follow Tariq on Twitter @tariqjmalik.

  • DrRaviSharma
    We are thankful to Roscosmos and for similar events to NASA for maturing such risky human missions so robust that such shutoffs and aborts are possible.
    Imaging from Soyuz and Apollo legacy how our knowledge and reliability are improving.
    Best Wishes.
    (Dr. Ravi Sharma, Ph.D. USA)
    NASA Apollo Achievement Award
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    Former MTS NASA HQ MSEB Apollo
    Former Scientific Secretary ISRO HQ
    Ontolog Board of Trustees
    Particle and Space Physics
    Senior Enterprise Architect

    SAE Fuel Cell Tech Committee voting member for 20 years.
    ORCID ID 0000-0002-2481-7993