Live coverage: 400th Proton rocket takes off with Russian satellite

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.

Russian cosmonaut Anatoly Ivanishin, Japanese flight engineer Takuya Onishi and NASA astronaut Kate Rubins departed the International Space Station on Saturday and headed for a homecoming in Kazakhstan to wrap up a 115-day expedition in orbit. Undocking occurred at 8:35 p.m. EDT Saturday (0035 GMT Sunday), with an on-target landing more than three hours later at 11:58 p.m. EDT (0358 GMT).

SpaceX’s fired the engines of its Falcon Heavy rocket at launch pad 39A at 12:30 p.m. EST (1730 GMT) on Wednesday. The crucial pre-launch engine test has been repeatedly delayed since the rocket returned to the launch pad earlier this month.