A planned launch on Saturday of a mission carrying three U.S. astronauts and a Russian cosmonaut to the International Space Station was canceled due to bad weather.

SpaceX announced the launch delay, and NASA said the agency is now targeting a launch of 10:53 pm ET on Sunday.

A SpaceX Crew Dragon capsule called Endeavor will carry the four people on a Falcon 9 rocket from the Kennedy Space Center in Florida.

Hours before Saturday night’s scheduled launch, SpaceX posted on X that “high winds” had forced a delay.

This is the latest postponement of a release originally scheduled for February 22.

Elon Musk’s SpaceX has been launching astronauts for NASA under its Commercial Crew program since 2020, while a rival program from Boeing Co. has yet to launch.

Matthew Dominick, who leads the Crew-8 mission, is making his first spaceflight with fellow American Jeanette Epps. Russian Alexander Grebenkin was also a first.

Michael Barratt is a doctor on his third visit to the International Space Station. His first two flights were on the space shuttle, which was discontinued in 2011.

Since Russia invaded Ukraine in 2022, space remains a rare area of ​​cooperation between the United States and Russia.

The crew will conduct experiments including using stem cells to create organoids, artificially grown organ-like clumps of cells to study degenerative diseases, and using microgravity environments to achieve three-dimensional cell growth not possible on Earth.

Joel Montalbano, NASA’s International Space Station program manager, told reporters that the United States is paying close attention to a “small leak” on the Russian side of the research platform, the latest of several recent issues on the Russian side.

The hatch was closed to isolate the leak from the rest of the International Space Station.