Cygnus OA-6: What’s onboard?

A replay of the United Launch Alliance Atlas 5 rocket launching the Orbital ATK’s commercial Cygnus cargo freighter to the International Space Station from Cape Canaveral, Florida.

An Antares booster emerged from its hangar on Virginia’s Eastern Shore and rolled out to its launch pad Thursday for the first time since a rocket failure grounded Orbital ATK’s cargo launcher in 2014.

Cameras mounted on United Launch Alliance’s Atlas 5 rocket show the fiery ride into space for NASA’s Mars 2020 Perseverance rover after taking off from Florida’s Space Coast.