Authors: Hamid V. Ansari
Radiation energy causes fluctuation of the molecules in vanes of the Crooks radiometer. Through this fluctuation, molecules of the vanes strike the adjacent air molecules and as reaction cause recoil of the vanes. It seems that this is also the mechanism of Nichols radiometer. But, in the vacuum of the space, there are not practically such molecules to be leaned by the striking molecules of the vanes of solar sails. So, the vanes will not recoiled to be propelled. It is shown that a comet’s tail and antitail are common tides produced by Sun rather than by radiation pressure.
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