Objects In Telescope Are Farther Than They Appear: How diffraction tricked Galileo into mismeasuring the distances to the stars

Details Objects In Telescope Are Farther Than They Appear: How diffraction tricked Galileo into mismeasuring the distances to the stars Objects In Telescope Are Farther Than They Appear: How diffraction tricked Galileo into mismeasuring the distances to the stars

2008-08-25

arxiv.org/abs/0808.3411v1

The Physics Teacher, v 47 (Sept. 2009), pp 362-365

Physics

History and Philosophy of Physics

Eight pages, 4 figures. This article has been accepted for publication by The Physics Teacher. After it is published, it will

Scientific paper

Galileo determined distances to stars based on the assumption that stars were suns, the apparent sizes of stars as seen through his telescope, and basic geometry. However, the apparent sizes that he measured were the result of diffraction and not related to the actual sizes of the stars. Galileo's methods and observations were good, but since he was unknowingly observing diffraction artifacts and not the physical bodies of stars he greatly underestimated the distances to the stars.

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