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Clocks in a strong gravitational field are predicted to run slower than
they would in a weaker field. Light is an oscillation (of electric and
magnetic fields), a kind of clock, and its frequency is thus predicted to be
lower where gravity is stronger. White dwarf spectra show red-shifts as
compared to main sequence stars of the same temperature; the red-shift is
just what general relativity implies.
2001-09-04