Two astronauts working outside the International Space Station Wednesday installed a European Space Agency data relay antenna and connected four of six cables to partially power a new ESA experiment platform. They also removed two solar array handling fixtures to clear the way for a future power system upgrade.

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.

Crew members aboard the International Space Station are investigating a tiny pressure leak on the Russian side of the orbiting outpost. The crew traced the leak to a small hole on the Soyuz MS-09 spacecraft, which ferried a three-person crew to the station in June. Mission control is examining options to repair the damage, and NASA says the crew is not in danger.