NASA's astronaut Don Pettit's return marked the end of a seven-month mission aboard the ISS alongside two Russian cosmonauts.

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NASA veteran Pettit made ISS his second home, where he spent time doing research and created the zero-gravity Space Cup.

In addition to Cargo Dragon, the US uses the Cygnus spacecraft from Northrop Grumman Corporation to dispatche cargoes to the ISS, but they burn in the atmosphere when returning to Earth.

Dragon rendezvoused with the space station this morning (April 22), docking with the orbital lab at 8:40 a.m. ET.