



STS-121 was a space shuttle mission to the International Space Station (ISS) flown by Space Shuttle Discovery.





The main purposes of the mission were to test new safety and repair techniques introduced following the Columbia disaster of February 2003 as well as to deliver supplies, equipment and European Space Agency (ESA) astronaut Thomas Reiter from Germany to the ISS.



After two weather-related delays, the shuttle successfully launched on Tuesday, 4 July 2006 at 14:37:55 EDT.





It was the first shuttle launch on the United States' Independence Day.





The mission lasted for 13 days before landing at the Kennedy Space Center on 17 July 2006 at 09:14:43 EDT.





During the operation down below image was photographed by NASA on 10 July, 2006, in which we can see the UFO :

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Image Source : NASA Wakeup calls are a long-standing tradition of the NASA program. Each day during the mission, flight controllers in the Mission Control Center will greet the crew with anmusical interlude.On 6th day of flight, 'I Had a Dream' by ABBA was played for Shuttle Pilot Mark Kelly. Down below is lyrics of the same:I have a dream, a song to singYou can take the future even if you failI believe in angelsI have a dreamI have a dream, a fantasyI believe in angelsSomething good in everything I seeI believe in angelsWhen I know the time is right for meI'll cross the stream - I have a dreamI'll cross the stream - I have a dream