• March 26, page 41: Nina Berova, winner of the 2007 Chirality Medal, is a research professor in the chemistry department of Columbia University.
    April 2, page 62: Spinhenge@home, a volunteer computer project to calculate spin dynamics of magnetic molecules, was spelled incorrectly.
Volume 85 Issue 16 | p. 6 | Letters
Issue Date: April 16, 2007

No Zero Gravity in orbit

Department: Letters

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
Carlisle, Ind.

 
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