Live coverage: Soyuz crew arrives at International Space Station

After four years of brainstorming, custom tool development and training, two astronauts plan to venture outside the International Space Station Friday for the first of four spacewalks to repair a $2 billion cosmic ray detector. The excursions are considered the most challenging since work to service the Hubble Space Telescope.

A French military spy satellite lifted off Tuesday atop a Soyuz rocket from French Guiana. Launch of Arianespace’s final mission of 2020 occurred at 11:42 a.m. EST (1642 GMT). Officials called off a launch attempt Monday because of unfavorable high-altitude winds over the spaceport in South America.

A European re-entry demonstrator launched aboard a solid-fueled Vega rocket at 1340 GMT (8:40 a.m. EST) from French Guiana, kicking off a whirlwind 102-minute around-the-world test flight to validate technologies that could be used on future reusable launchers and spaceships.