Issue Date: April 16, 2007
No Zero Gravity in orbit
A PICTURE CAPTION in the interview with Mae Jemison describes Jemison "performing experiments at zero gravity on board a space shuttle" (C&EN, March 26, page 39).
One physics textbook states that the force of gravity is reduced no more than 10% on the shuttle in orbit. Gravity holds the shuttle in orbit. Centrifugal force, due to inertia, equal and opposite gravity, makes things in orbit weightless!
James F. Jackson
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