An unmanned cargo ship operated by the US company Orbital ATK arrived today at the International Space Station to deliver 2.5 tons of food and supplies to the six astronauts living in orbit. Three Russian cosmonauts, two American astronauts and one Japanese astronauts are currently staffing the space station, which is the size of a six-bedroom house and circles the Earth every 90 minutes.<br/><br/>The cargo ship was launched on October 17 from NASA's Wallops Flight Facility in Virginia.It will remain attached to the space station until November. Astronauts will fill it with trash before sending it off to burn upon re-entry to Earth's atmosphere.