Photos: More Atlas 5 launch shots

Passing a major pre-flight milestone ahead of a launch and landing planned early Sunday, a SpaceX Falcon 9 rocket ignited its main engines Wednesday for a hold-down firing at Cape Canaveral.

Watch a replay of the launch Monday of an Orbital ATK Antares rocket carrying a commercial cargo craft destined for the International Space Station.

Watch the post-launch press conference held at the Kennedy Space Center following the successful launch of an Atlas 5 carrying Orbital ATK’s Cygnus AO-6 cargo craft, which is headed to the International Space Station.