SpaceX CRS-6 was a cargo resupply mission to the International Space Station related with NASA, also called SpX-6. It was the sixth SpaceX operational mission contracted to NASA (Commercial Resupply Services) and the eight flight for SpaceX's Dragon cargo spacecraft without crew. It started on 17 April ,ended on 21 May 2015 in the International Space Station.
NASA has contracted for the mission of CRS-6 FROM SpaceX and because of that fact determines the date of launch, orbital parameters for the Dragon space capsule and primary payload. The Dragon will be filled with 2015 kg of supplies and payloads including materials.
Spacecraft included science payloads. Thanks to them was opportunity to counteract the microgravity and the effects of it on the most popular cells in bones, future knowledge about osteporosis and muscle wasting conditions.