The firm, established by Amazon entrepreneur Jeff Bezos, has a design for a capsule and two-stage rocket.
BBC: US firms target astronaut flights
The two variants share many design features but use different engines in their third segment, or stage - the part of the Soyuz said to have been responsible for the failure five days ago.
BBC: Soyuz back in service after failed launch
One interesting aspect of the Antares design is its use of two Aerojet AJ-26 engines on its liquid-fuelled first stage.
BBC: Orbital's Antares rocket makes test flight
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