Intensity Fluctuations of a Relativistically Expanding Source

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Science  14 Apr 1967:
Vol. 156, Issue 3772, pp. 239-240
DOI: 10.1126/science.156.3772.239


It is shown that the relation between the size of an object and the period of a fluctuation in its brightness must be modified if the surface whose brightness is fluctuating is expanding at a relativistic velocity, in the sense that faster fluctuations are possible for the expanding surface.

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