Live coverage: International crew lands in Kazakhstan

Rocket Lab announced Saturday it will hold off launching an Electron rocket on an orbital test flight until early 2018 as officials face the end of a 10-day pre-approved launch window, after a series of scrubs to ensure the booster is ready for liftoff and wait for ideal weather conditions.

Fueled segments of the solid rocket boosters that will lift off on the first flight of NASA’s Space Launch System have arrived at the Kennedy Space Center in Florida, but officials will hold off on stacking the boosters until the SLS core stage completes a crucial test-firing later this year.

Astronauts Steve Bowen and Woody Hoburg suited up and floated outside the International Space Station Friday for a spacewalk to install and unroll an upgraded solar array wing delivered to the complex earlier this week by a SpaceX Cargo Dragon supply ship.