The biggest problem of sending spacecraft into space || #space #nasa

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The biggest problem of sending spacecraft into space || #space #nasa
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In this video I have told what is the biggest problem in completing the mission sent into space. For example, I have told the journey of the Mars Mission Opportunity sent by NASA in 2003.
Ishan Investigates,
ishan investigates,
Ishan investigates,
ISHAN INVESTIGATES,