It is a two-stage rocket powered by liquid oxygen and kerosene.

BBC: The new Falcon 1 rocket has been lost on its maiden flight.

The concept calls for a two-stage rocket that would be powered by engines burning liquid oxygen and kerosene.

BBC: Science & Environment

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