Live coverage: Soyuz crew capsule departs station, lands in Kazakhstan

Investigators believe a leak of propellant inside the Crew Dragon spacecraft’s propulsion system led to the capsule’s explosion April 20 during a ground test at Cape Canaveral, and a senior SpaceX official said Monday that delays are making it “increasingly difficult” to fly astronauts on the commercial spaceship before the end of the year.

A SpaceX Falcon 9 rocket and Crew Dragon capsule were raised vertical at launch pad 39A in Florida late Thursday, setting the stage for a launch day dress rehearsal Friday with NASA astronauts Doug Hurley and Bob Behnken — the veteran space fliers assigned to the Crew Dragon’s first piloted mission later this year — before a critical in-flight test of the ship’s emergency escape system Saturday.

Stormy weather at the Kennedy Space Center forced SpaceX to scrub the liftoff of a Falcon Heavy rocket Thursday night carrying the ViaSat 3 Americas broadband satellite to a near-geostationary orbit.