Private Antares Rocket & Cygnus Spacecraft Explained.

Virginia-based Orbital Sciences holds a $1.9 billion NASA contract to make eight unmanned supply runs to the International Space Station with its Antares rocket and Cygnus cargo ferry.
The two-stage Antares launch vehicle burns liquid oxygen (LOX) and kerosene (RP-1). The rocket's height overall is 131 feet (40 meters). Its liftoff weight is 530,000 pounds (240,000 kilograms). The Antares rocket was originally called Taurus 2. [Photos: Orbital's Antares Rocket and Cygnus Capsule]

The Cygnus pressurized cargo module can carry up to 5,952 pounds (2,700 kg) of payload to the International Space Station.

At the rear of Cygnus is a service module containing avionics, power, communications and command and control hardware. On the outside of the service module are twin fixed-wing gallium arsenide solar arrays  capable of putting out 3.5 kilowatts of electricity.

Future Cygnus spacecraft will be enhanced with a larger pressurized cargo module and lightweight solar panels.
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