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Wikipedia dixit:

“SpaceX CRS-10, also known as SpX-10 or simply CRS-10, is a cargo resupply mission to the International Space Station. The mission was contracted by NASA and was launched by SpaceX aboard a Dragon spacecraft on 19 February 2017. The mission is currently active, with the Dragon spacecraft in orbit adjusting and preparing for docking to the ISS, which is expected between 21 February and 22 February 2017. CRS-10 is part of the original order of twelve missions awarded to SpaceX under the Commercial Resupply Services contract. As of June 2016, a NASA Inspector General report had this mission manifested for November 2016. The launch was put on hold pending investigation of the pad explosion in September 2016, with a tentative date no earlier than January 2017, subsequently set for 18 February.

CRS-10 was launched from Kennedy Space Center Launch Complex 39 Pad A, the first launch from the complex since STS-135 on 8 July 2011, the last flight of the Space Shuttle program; this complex is also where the Apollo missions were launched. On 12 February 2017, SpaceX successfully completed a static fire test of the Falcon 9 engines on Pad 39A. An initial launch attempt on 18 February 2017 was scrubbed 13 seconds before its 15:01 UTC launch due to a thrust vector control system issue, resulting in a 24-hour hold for launch no earlier than 19 February at 14:38:59 UTC.

Following the successful Launch on 19 February, the first stage returned and landed safely in landing Zone 1.

NASA has contracted for the CRS-10 mission from SpaceX and therefore determines the primary payload, date/time of launch, and orbital parameters for the Dragon space capsule. CRS-10 is expected to carry 1,530 kg (3,373.1 lb) of pressurized mass and 960 kg (2,116.4 lb) unpressurized. External payloads on the CRS-10 spacecraft are the SAGE III Earth observation experiment and its Nadir Viewing Platform (NVP), and the U.S. Department of Defense’s Space Test Program H5 (STP-H5) package, including the Raven navigation investigation and the Lightning Imaging Sensor. Some science payloads include ACME, LMM Biophysics, ZBOT, and CIR/Cool Flames.”

Video credit: SpaceX