Context: On May 27, NASA’s SpaceX Demo-2 test flight will lift off for the International Space Station (ISS), becoming the first crewed flight to launch from American soil since the conclusion of the space shuttle era in 2011.


  • Boeing and SpaceX were selected by NASA in September 2014 to develop transportation systems meant to transfer crew from the US to the ISS. 
  • These integrated spacecraft, rockets and associated systems will carry up to four astronauts on NASA missions, maintaining a space station crew of seven to maximize time dedicated to scientific research in the orbiting laboratory.

The Demo-2 mission:

  • The Demo-2 mission is part of NASA’s Commercial Crew Program, and will see astronauts Robert Behnken and Douglas Hurley fly on SpaceX’s Crew Dragon spacecraft. 
  • The craft will lift off from a Falcon 9 rocket, from Florida.
  • Essentially, the lift-off is a flight test to certify if SpaceX’s crew transportation system can be used to ferry crew to and from the space station regularly.
  • This is the final flight test for the system and intends to validate its different components, including the spacecraft (Crew Dragon), the launch vehicle (Falcon 9), the launch pad (LC-39A) and the operations capabilities.
  • Crew Dragon: The Crew Dragon spacecraft being used for this mission can stay in orbit for up to 110 days, though the specific duration is yet to be determined. 
    • If SpaceX spacecraft are used regularly, they will need to stay in orbit for a period of at least 210 days as per NASA’s requirements.

The Commercial Crew Program of NASA

  • Enable greater Scientific research: The main objective of this program is to make access to space easier in terms of its cost, so that cargo and crew can be easily transported to and from the ISS.
  • By encouraging private companies such as Boeing and SpaceX to provide crew transportation services to and from low-Earth orbit, NASA can focus on building spacecraft and rockets meant for deep space exploration missions.
  • The Program has worked with several American aerospace industry companies to facilitate the development of US human spaceflight systems since 2010.

International Space Station


Low Earth Orbit(LEO)

It orbits Earth every 90 minutes.


Principal space agencies

1.NASA (United States)

2.Roscosmos (Russia)

3.JAXA (Japan)

4.ESA (Europe)

5.CSA (Canada)



It serves as a home where crews of astronauts and cosmonauts live. 

The space station is also a unique science laboratory.


Image Source: SpaceX