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SpaceX CRS-10

SpaceX CRS-10, also known as SpX-10, was a Dragon Commercial Resupply Service mission to the International Space Station (ISS) which launched on 19 February 2017. The mission was contracted by NASA as part of its Commercial Resupply Services program and was launched by SpaceX aboard the 30th flight of the Falcon 9 rocket. The mission ended on 19 March 2017 when the Dragon spacecraft left the ISS and safely returned to Earth.

SpaceX CRS-10
Dragon approaching the ISS on 23 February 2017
Mission typeISS resupply
OperatorSpaceX
COSPAR ID2017-009A
SATCAT no.42053
Mission durationPlanned: 28 days
Final: 28 days, 7 minutes
Spacecraft properties
SpacecraftDragon C112
Spacecraft typeDragon CRS
ManufacturerSpaceX
Dry mass4,200 kg (9,300 lb)
DimensionsHeight: 7.2 m (24 ft)
Diameter: 3.7 m (12 ft)
Start of mission
Launch date19 February 2017, 14:39:00 (2017-02-19UTC14:39) UTC[1]
RocketFalcon 9 Full Thrust
Launch siteKennedy LC-39A
ContractorSpaceX
End of mission
DisposalRecovered
Landing date19 March 2017, 14:46 (2017-03-19UTC14:47) UTC[2]
Landing sitePacific Ocean, 320 km (200 mi) SW of Long Beach, California[2]
Orbital parameters
Reference systemGeocentric
RegimeLow Earth
Semi-major axis6,783.13 km (4,214.84 mi)
Eccentricity0.000715
Perigee altitude400.14 km (248.64 mi)
Apogee altitude409.85 km (254.67 mi)
Inclination51.6402°
Period92.7 minutes
Epoch2 March 2017, 13:20:36 UTC[3]
Berthing at ISS
Berthing portHarmony nadir
RMS capture23 February 2017, 10:44 UTC[4]
Berthing date23 February 2017, 13:12 UTC[4]
Unberthing date18 March 2017, 21:20 UTC[5]
RMS release19 March 2017, 09:11 UTC[6]
Time berthed23 days, 8 hours, 8 minutes
Payload
SAGE III and SAGE-NVP, STP-H5, etc.
Mass2,490 kg (5,490 lb)[7]
Pressurised1,530 kg (3,373 lb)[7]
Unpressurised960 kg (2,116 lb)[7]

NASA SpX-10 mission patch
← OA-5
OA-7 →
 

Operations history edit

CRS-10 is part of the original order of twelve missions awarded to SpaceX under the Commercial Resupply Services contract.[8] In June 2016, a NASA Inspector General report had this mission manifested for November 2016.[9] The launch was then put on hold pending investigation of the pad explosion in September 2016, with a tentative date no earlier than January 2017,[10] subsequently set for 18 February.

 
Launch of CRS-10 from LC-39A

On 12 February 2017, SpaceX successfully completed a static fire test of the Falcon 9 engines on Pad 39A.[11] An initial launch attempt on 18 February 2017 was scrubbed 13 seconds before its 15:01:32 UTC launch due to a thrust vector control system issue in the rocket's second stage,[12] resulting in a 24-hour hold for launch no earlier than 19 February at 14:39 UTC.[13] The faulty actuator was repaired at the launch pad overnight, and the rocket was returned to vertical approximately six hours before the scheduled launch time.[1]

CRS-10 was launched from Kennedy Space Center Launch Complex 39 Pad A on 19 February 2017 at 14:39 UTC,[1] the first launch from the complex since STS-135 on 8 July 2011, the last flight of the Space Shuttle program, and the first uncrewed mission from the site since the launch of the Skylab space station on 14 May 1973; this complex is also where the Apollo missions were launched.[14]

Following the successful launch, the first stage proceeded through a three-burn flyback and landed safely in Landing Zone 1, the first daytime landing of a Falcon rocket on land.[1]

The Dragon spacecraft rendezvoused with the International Space Station on 22 February, but its approach was automatically aborted by an on-board computer at 08:25 UTC when a data error was reported in its navigation system. This is the first rendezvous abort by a Dragon spacecraft. The problem was traced to an incorrect data value in the spacecraft's Global Positioning System, critical to operations as this data informs the vehicle of its relative position to the space station.[15][16] The abort resulted in a 24-hour hold on its approach. The error was corrected in this time, during which the spacecraft entered a "racetrack" trajectory around the station to reset its approach.[17][18] An error-free second attempt resulted in Dragon being captured by the station's Canadarm2 on 23 February at 10:44 UTC, with berthing to the Harmony module taking place a few hours later at 13:12 UTC.[4] This abort was later revealed in a NASA Inspector General audit to have resulted from incompatibilities between NASA's and SpaceX's software development processes.[19]

The CRS-10 mission ended on 19 March 2017. The Dragon spacecraft was detached from the International Space Station by Canadarm2 on 18 March 2017 at 21:20 UTC,[5] moved to a stow position below the station where it stayed overnight, and was released at 09:11 UTC.[6] Dragon performed three departure burns to move it away from the station before conducting a final de-orbit burn at around 14:00 UTC.[6] The spacecraft splashed down in the Pacific Ocean at 14:46 UTC,[2] about 320 km (200 mi) southwest from Long Beach, California.[20]

Dragon returned 1,652 kg (3,642 lb) of material from the ISS, including research samples, science and crew equipment, and spacewalking hardware. Also removed from the station was 811 kg (1,788 lb) of external payload—including a MISSE module, the OPALS experiment, and Robotic Refueling Mission demonstration equipment—which was placed in Dragon's unpressurized trunk and disposed of when the trunk section burned up on re-entry.[20]

Primary payload edit

NASA contracted the CRS-10 mission from SpaceX and therefore determined the primary payload, date/time of launch, and orbital parameters for the Dragon space capsule. CRS-10 carried a total of 2,490 kg (5,490 lb) of cargo to the International Space Station, including 1,530 kg (3,373 lb) of pressurized cargo including packaging and 960 kg (2,116 lb) of unpressurized cargo.[7] 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 Houston 5 (STP-H5) package including the Raven navigation investigation and the Lightning Imaging Sensor.[21] Some science payloads include ACME, LMM Biophysics, ZBOT,[22] and CIR/Cool Flames.[23]

The following is a breakdown of cargo bound for the ISS:[7]

  • Science investigations: 732 kg (1,614 lb)
  • Crew supplies: 296 kg (653 lb)
  • Vehicle hardware: 382 kg (842 lb)
  • Spacewalk equipment: 10 kg (22 lb)
  • Computer resources: 11 kg (24 lb)
  • Russian hardware: 22 kg (49 lb)
  • External payloads:
    • SAGE-III: 527 kg (1,162 lb)[24]
    • STP-H5: 433 kg (955 lb)

Trial of new flight safety system edit

SpaceX's CRS-10 launch was the "first operational use"[25] of the Autonomous Flight Safety System (AFSS) on "either of Air Force Space Command's Eastern or Western Ranges." AFSS is replacing "the ground-based mission flight control personnel and equipment with on-board Positioning, Navigation and Timing sources and decision logic. The benefits of AFSS include increased public safety, reduced reliance on range infrastructure, reduced range spacelift cost, increased schedule predictability and availability, operational flexibility, and launch slot flexibility."[26] The system consists of software developed by NASA, the Air Force, and DARPA, to which SpaceX adds an additional software layer customized for its rocket. AFSS has flown on 13 previous Falcon 9 missions in a so-called "shadow mode" for testing.[27][28]

Gallery edit

See also edit

References edit

  1. ^ a b c d Clark, Stephen (19 February 2017). "Historic launch pad back in service with thundering blastoff by SpaceX". Spaceflight Now. Retrieved 5 March 2017.
  2. ^ a b c Garcia, Mark (19 March 2017). "Dragon Splashes Down in Pacific Ocean". NASA. Retrieved 19 March 2017.
  3. ^ "Dragon CRS-10 - Orbit". Heavens Above. 2 March 2017. Retrieved 3 March 2017.
  4. ^ a b c Richardson, Derek (23 February 2017). "10th Dragon captured at International Space Station". Spaceflight Insider. Retrieved 5 March 2017.
  5. ^ a b "Dragon departs Space Station after busy Cargo Mission, en-route to Splashdown Landing". Spaceflight 101. 19 March 2017. Retrieved 20 March 2017.
  6. ^ a b c Bergin, Chris (19 March 2017). "CRS-10 Dragon completes homecoming to conclude successful ISS mission". NASASpaceFlight.com. Retrieved 20 March 2017.
  7. ^ a b c d e "SpaceX CRS-10 Mission Overview" (PDF). NASA. Retrieved 18 February 2017.
  8. ^ de Selding, Peter B. (24 February 2016). "SpaceX wins 5 new space station cargo missions in NASA contract estimated at $700 million". Space News. Retrieved 24 February 2016.
  9. ^ NASA's Response to SpaceX's June 2015 Launch Failure: Impacts on Commercial Resupply of the International Space Station (PDF) (Report). NASA Office of Inspector General. 28 June 2016. p. 13. IG-16-025. Retrieved 18 July 2016.
  10. ^ Clark, Stephen (31 October 2016). "SpaceX hopes procedure fix can allow Falcon 9 launches to resume". Spaceflight Now. NASA officials also expect SpaceX's next resupply mission to the International Space Station to blast off around mid-January, at the soonest.
  11. ^ Field, Kyle (13 February 2017). "SpaceX completes Falcon 9 static fire test from historic LC-39A in preparation for Feb. 18 launch". Teslarati. Retrieved 18 February 2017.
  12. ^ Siceloff, Steven (18 February 2017). "Launch Scrubbed". NASA. Retrieved 18 February 2017.
  13. ^ Siceloff, Steven (18 February 2017). "Potential Sunday Launch Opportunity: 9:38:59 a.m. EST". NASA. Retrieved 18 February 2017.
  14. ^ Graham, William (17 February 2017). "SpaceX debuts Falcon 9 launch from 39A with CRS-10 Dragon mission". NASA Spaceflight. Retrieved 18 February 2017.
  15. ^ Richardson, Derek (22 February 2017). "Dragon rendezvous aborted, next attempt in 24 hours". Spaceflight Insider. Retrieved 5 March 2017.
  16. ^ Hardwood, William (22 February 2017). "SpaceX cargo ship aborts approach to station". CBS News. Retrieved 5 March 2017.
  17. ^ Garcia, Mark (22 February 2017). "Crew Prepares for U.S. and Russian Space Deliveries". NASA. Retrieved 5 March 2017.
  18. ^ Malik, Tariq (23 February 2017). "SpaceX Dragon Delivers NASA Cargo to Space Station After 24-Hour Delay". Space.com. Retrieved 5 March 2017.
  19. ^ Audit of Commercial Resupply Services to the International Space Station (PDF) (Report). NASA Office of Inspector General. 26 April 2018. p. 29. IG-18-016. Retrieved 27 April 2018.
  20. ^ a b Clark, Stephen (19 March 2017). "SpaceX's Dragon supply carrier wraps up 10th mission to space station". Spaceflight Now. Retrieved 19 March 2017.
  21. ^ Clark, Stephen (15 February 2017). "Cargo manifest for SpaceX's 10th space station resupply mission". Spaceflight Now. Retrieved 18 February 2017.
  22. ^ "Zero Boil-Off Tank (ZBOT)". NASA. 22 November 2016. Retrieved 18 February 2017.
  23. ^ . NASA / Glenn Research Center. Archived from the original on 5 September 2015. Retrieved 18 February 2017.
  24. ^ Damadeo, Kristyn; Hanson, Heather (2015). (PDF). NASA. p. 10. NP-2015-10-356-GSFC. Archived from the original (PDF) on 23 December 2016.
  25. ^ Messier, Doug (26 February 2017). "Air Force Eastern Range Innovates With Autonomous Flight Safety System". Parabolic Arc. Retrieved 20 March 2017.
  26. ^ "45th SW supports SpaceX's CRS-10 launch". United States Air Force. 45th Space Wing Public Affairs. 19 February 2017. Retrieved 16 March 2017.
  27. ^ Dean, James (11 March 2017). "Only on Falcon 9: Automated system can terminate SpaceX rocket launches". Florida Today. Retrieved 20 March 2017.
  28. ^ https://www.nasaspaceflight.com/2017/03/air-force-reveals-48-launches-year-cape/, Chris Gebhardt, NASASpaceflight.com, 20 March 2017, accessed 30 March 2017.

External links edit

  •   Media related to SpaceX CRS-10 at Wikimedia Commons
  • Dragon website at SpaceX.com
  • Commercial Resupply Services at NASA.gov

spacex, redirects, here, northrop, grumman, mission, cygnus, also, known, dragon, commercial, resupply, service, mission, international, space, station, which, launched, february, 2017, mission, contracted, nasa, part, commercial, resupply, services, program, . CRS 10 redirects here For the Northrop Grumman CRS 10 mission see Cygnus NG 10 SpaceX CRS 10 also known as SpX 10 was a Dragon Commercial Resupply Service mission to the International Space Station ISS which launched on 19 February 2017 The mission was contracted by NASA as part of its Commercial Resupply Services program and was launched by SpaceX aboard the 30th flight of the Falcon 9 rocket The mission ended on 19 March 2017 when the Dragon spacecraft left the ISS and safely returned to Earth SpaceX CRS 10Dragon approaching the ISS on 23 February 2017Mission typeISS resupplyOperatorSpaceXCOSPAR ID2017 009ASATCAT no 42053Mission durationPlanned 28 days Final 28 days 7 minutesSpacecraft propertiesSpacecraftDragon C112Spacecraft typeDragon CRSManufacturerSpaceXDry mass4 200 kg 9 300 lb DimensionsHeight 7 2 m 24 ft Diameter 3 7 m 12 ft Start of missionLaunch date19 February 2017 14 39 00 2017 02 19UTC14 39 UTC 1 RocketFalcon 9 Full ThrustLaunch siteKennedy LC 39AContractorSpaceXEnd of missionDisposalRecoveredLanding date19 March 2017 14 46 2017 03 19UTC14 47 UTC 2 Landing sitePacific Ocean 320 km 200 mi SW of Long Beach California 2 Orbital parametersReference systemGeocentricRegimeLow EarthSemi major axis6 783 13 km 4 214 84 mi Eccentricity0 000715Perigee altitude400 14 km 248 64 mi Apogee altitude409 85 km 254 67 mi Inclination51 6402 Period92 7 minutesEpoch2 March 2017 13 20 36 UTC 3 Berthing at ISSBerthing portHarmony nadirRMS capture23 February 2017 10 44 UTC 4 Berthing date23 February 2017 13 12 UTC 4 Unberthing date18 March 2017 21 20 UTC 5 RMS release19 March 2017 09 11 UTC 6 Time berthed23 days 8 hours 8 minutesPayloadSAGE III and SAGE NVP STP H5 etc Mass2 490 kg 5 490 lb 7 Pressurised1 530 kg 3 373 lb 7 Unpressurised960 kg 2 116 lb 7 NASA SpX 10 mission patch Commercial Resupply Services OA 5OA 7 Cargo Dragon SpaceX CRS 9SpaceX CRS 11 Contents 1 Operations history 2 Primary payload 3 Trial of new flight safety system 4 Gallery 5 See also 6 References 7 External linksOperations history editCRS 10 is part of the original order of twelve missions awarded to SpaceX under the Commercial Resupply Services contract 8 In June 2016 a NASA Inspector General report had this mission manifested for November 2016 9 The launch was then put on hold pending investigation of the pad explosion in September 2016 with a tentative date no earlier than January 2017 10 subsequently set for 18 February nbsp Launch of CRS 10 from LC 39AOn 12 February 2017 SpaceX successfully completed a static fire test of the Falcon 9 engines on Pad 39A 11 An initial launch attempt on 18 February 2017 was scrubbed 13 seconds before its 15 01 32 UTC launch due to a thrust vector control system issue in the rocket s second stage 12 resulting in a 24 hour hold for launch no earlier than 19 February at 14 39 UTC 13 The faulty actuator was repaired at the launch pad overnight and the rocket was returned to vertical approximately six hours before the scheduled launch time 1 CRS 10 was launched from Kennedy Space Center Launch Complex 39 Pad A on 19 February 2017 at 14 39 UTC 1 the first launch from the complex since STS 135 on 8 July 2011 the last flight of the Space Shuttle program and the first uncrewed mission from the site since the launch of the Skylab space station on 14 May 1973 this complex is also where the Apollo missions were launched 14 Following the successful launch the first stage proceeded through a three burn flyback and landed safely in Landing Zone 1 the first daytime landing of a Falcon rocket on land 1 The Dragon spacecraft rendezvoused with the International Space Station on 22 February but its approach was automatically aborted by an on board computer at 08 25 UTC when a data error was reported in its navigation system This is the first rendezvous abort by a Dragon spacecraft The problem was traced to an incorrect data value in the spacecraft s Global Positioning System critical to operations as this data informs the vehicle of its relative position to the space station 15 16 The abort resulted in a 24 hour hold on its approach The error was corrected in this time during which the spacecraft entered a racetrack trajectory around the station to reset its approach 17 18 An error free second attempt resulted in Dragon being captured by the station s Canadarm2 on 23 February at 10 44 UTC with berthing to the Harmony module taking place a few hours later at 13 12 UTC 4 This abort was later revealed in a NASA Inspector General audit to have resulted from incompatibilities between NASA s and SpaceX s software development processes 19 The CRS 10 mission ended on 19 March 2017 The Dragon spacecraft was detached from the International Space Station by Canadarm2 on 18 March 2017 at 21 20 UTC 5 moved to a stow position below the station where it stayed overnight and was released at 09 11 UTC 6 Dragon performed three departure burns to move it away from the station before conducting a final de orbit burn at around 14 00 UTC 6 The spacecraft splashed down in the Pacific Ocean at 14 46 UTC 2 about 320 km 200 mi southwest from Long Beach California 20 Dragon returned 1 652 kg 3 642 lb of material from the ISS including research samples science and crew equipment and spacewalking hardware Also removed from the station was 811 kg 1 788 lb of external payload including a MISSE module the OPALS experiment and Robotic Refueling Mission demonstration equipment which was placed in Dragon s unpressurized trunk and disposed of when the trunk section burned up on re entry 20 Primary payload editNASA contracted the CRS 10 mission from SpaceX and therefore determined the primary payload date time of launch and orbital parameters for the Dragon space capsule CRS 10 carried a total of 2 490 kg 5 490 lb of cargo to the International Space Station including 1 530 kg 3 373 lb of pressurized cargo including packaging and 960 kg 2 116 lb of unpressurized cargo 7 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 Houston 5 STP H5 package including the Raven navigation investigation and the Lightning Imaging Sensor 21 Some science payloads include ACME LMM Biophysics ZBOT 22 and CIR Cool Flames 23 The following is a breakdown of cargo bound for the ISS 7 Science investigations 732 kg 1 614 lb Crew supplies 296 kg 653 lb Vehicle hardware 382 kg 842 lb Spacewalk equipment 10 kg 22 lb Computer resources 11 kg 24 lb Russian hardware 22 kg 49 lb External payloads SAGE III 527 kg 1 162 lb 24 STP H5 433 kg 955 lb Trial of new flight safety system editSpaceX s CRS 10 launch was the first operational use 25 of the Autonomous Flight Safety System AFSS on either of Air Force Space Command s Eastern or Western Ranges AFSS is replacing the ground based mission flight control personnel and equipment with on board Positioning Navigation and Timing sources and decision logic The benefits of AFSS include increased public safety reduced reliance on range infrastructure reduced range spacelift cost increased schedule predictability and availability operational flexibility and launch slot flexibility 26 The system consists of software developed by NASA the Air Force and DARPA to which SpaceX adds an additional software layer customized for its rocket AFSS has flown on 13 previous Falcon 9 missions in a so called shadow mode for testing 27 28 Gallery editSpaceX CRS 10 nbsp CRS 10 at LC 39A before launch nbsp Launch of CRS 10 nbsp Falcon 9 landing at LZ 1 nbsp Dragon approaching the ISS nbsp Dragon after landingSee also edit nbsp Spaceflight portalUncrewed spaceflights to the International Space Station List of Falcon 9 and Falcon Heavy launchesReferences edit a b c d Clark Stephen 19 February 2017 Historic launch pad back in service with thundering blastoff by SpaceX Spaceflight Now Retrieved 5 March 2017 a b c Garcia Mark 19 March 2017 Dragon Splashes Down in Pacific Ocean NASA Retrieved 19 March 2017 Dragon CRS 10 Orbit Heavens Above 2 March 2017 Retrieved 3 March 2017 a b c Richardson Derek 23 February 2017 10th Dragon captured at International Space Station Spaceflight Insider Retrieved 5 March 2017 a b Dragon departs Space Station after busy Cargo Mission en route to Splashdown Landing Spaceflight 101 19 March 2017 Retrieved 20 March 2017 a b c Bergin Chris 19 March 2017 CRS 10 Dragon completes homecoming to conclude successful ISS mission NASASpaceFlight com Retrieved 20 March 2017 a b c d e SpaceX CRS 10 Mission Overview PDF NASA Retrieved 18 February 2017 de Selding Peter B 24 February 2016 SpaceX wins 5 new space station cargo missions in NASA contract estimated at 700 million Space News Retrieved 24 February 2016 NASA s Response to SpaceX s June 2015 Launch Failure Impacts on Commercial Resupply of the International Space Station PDF Report NASA Office of Inspector General 28 June 2016 p 13 IG 16 025 Retrieved 18 July 2016 Clark Stephen 31 October 2016 SpaceX hopes procedure fix can allow Falcon 9 launches to resume Spaceflight Now NASA officials also expect SpaceX s next resupply mission to the International Space Station to blast off around mid January at the soonest Field Kyle 13 February 2017 SpaceX completes Falcon 9 static fire test from historic LC 39A in preparation for Feb 18 launch Teslarati Retrieved 18 February 2017 Siceloff Steven 18 February 2017 Launch Scrubbed NASA Retrieved 18 February 2017 Siceloff Steven 18 February 2017 Potential Sunday Launch Opportunity 9 38 59 a m EST NASA Retrieved 18 February 2017 Graham William 17 February 2017 SpaceX debuts Falcon 9 launch from 39A with CRS 10 Dragon mission NASA Spaceflight Retrieved 18 February 2017 Richardson Derek 22 February 2017 Dragon rendezvous aborted next attempt in 24 hours Spaceflight Insider Retrieved 5 March 2017 Hardwood William 22 February 2017 SpaceX cargo ship aborts approach to station CBS News Retrieved 5 March 2017 Garcia Mark 22 February 2017 Crew Prepares for U S and Russian Space Deliveries NASA Retrieved 5 March 2017 Malik Tariq 23 February 2017 SpaceX Dragon Delivers NASA Cargo to Space Station After 24 Hour Delay Space com Retrieved 5 March 2017 Audit of Commercial Resupply Services to the International Space Station PDF Report NASA Office of Inspector General 26 April 2018 p 29 IG 18 016 Retrieved 27 April 2018 a b Clark Stephen 19 March 2017 SpaceX s Dragon supply carrier wraps up 10th mission to space station Spaceflight Now Retrieved 19 March 2017 Clark Stephen 15 February 2017 Cargo manifest for SpaceX s 10th space station resupply mission Spaceflight Now Retrieved 18 February 2017 Zero Boil Off Tank ZBOT NASA 22 November 2016 Retrieved 18 February 2017 Space Flight Systems Planned Flights NASA Glenn Research Center Archived from the original on 5 September 2015 Retrieved 18 February 2017 Damadeo Kristyn Hanson Heather 2015 SAGE III Stratospheric Aerosol and Gas Experiment on the International Space Station PDF NASA p 10 NP 2015 10 356 GSFC Archived from the original PDF on 23 December 2016 Messier Doug 26 February 2017 Air Force Eastern Range Innovates With Autonomous Flight Safety System Parabolic Arc Retrieved 20 March 2017 45th SW supports SpaceX s CRS 10 launch United States Air Force 45th Space Wing Public Affairs 19 February 2017 Retrieved 16 March 2017 Dean James 11 March 2017 Only on Falcon 9 Automated system can terminate SpaceX rocket launches Florida Today Retrieved 20 March 2017 https www nasaspaceflight com 2017 03 air force reveals 48 launches year cape Chris Gebhardt NASASpaceflight com 20 March 2017 accessed 30 March 2017 External links edit nbsp Media related to SpaceX CRS 10 at Wikimedia Commons Dragon website at SpaceX com Commercial Resupply Services at NASA gov Portal nbsp Spaceflight Retrieved from https en wikipedia org w index php title SpaceX CRS 10 amp oldid 1216037747, wikipedia, wiki, book, books, library,

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