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The gravitational pull between earth and the spacecraft will become insignificant.
It prevents the spacecraft from being launched as gravity causes it to be attracted towards earth.
It must overcome Earth's gravity.
Astronaut
Mercury Friendship 7 (John H. Glenn, USA) was the first spacecraft to orbit the Earth three times.
First you must figure out how close Mars can get to the earth.
The gravitational pull between earth and the spacecraft will become insignificant.
No spacecraft from Earth has ever landed on Neptune.
the Friendship 7 spacecraft
It prevents the spacecraft from being launched as gravity causes it to be attracted towards earth.
No.
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Every known spacecraft began on earth and went to other places. That's also true of every known drawing, component, fragment, subsystem, and model of spacecraft. Few of them ever returned to earth.
Friction as the spacecraft comes into contact with the earth's atmosphere.
The Space Shuttle Atlantis.
Only those that originated from the Earth.