Astronomy and Space
A flyby () is a spaceflight operation in which a spacecraft passes near another body, which is usually a target of the space exploration mission and may also be a source of a gravity assist to impel it towards another target in a swing-by. The term has also been used to describe the passing of bodies to Earth, as of asteroids. Important parameters are the time and distance of closest approach.
Gamma Columbae.
Extravehicular activity.
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