John Bahcall, American astrophysicist

John Bahcall, American astrophysicist

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Credit: EMILIO SEGRE VISUAL ARCHIVES/AMERICAN INSTITUTE OF PHYSICS/SCIENCE PHOTO LIBRARY

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Caption: John Bahcall (1934-2005), American astrophysicist. Bahcall is most famous for his contribution to the solar neutrino problem. He and Raymond Davis devised an experiment that counted neutrinos (elementary particles) emitted by the Sun. However, the actual number counted was much lower than the amount predicted in Bahcall's calculations. This problem was not resolved until 2002, when the discrepancy was found to be caused by neutrinos oscillating between their three different types, or flavours. Bahcall also contributed to the development of the Hubble Space Telescope.

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