Physics
Scientific paper
Sep 1933
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1933natur.132..406c&link_type=abstract
Nature, Volume 132, Issue 3332, pp. 406 (1933).
Physics
Scientific paper
IT is generally assumed that the observed red shift in the spectra of distant nebulæ is evidence of velocities of recession and not due to loss of energy in the photon with time. The speed of recession is found to increase in proportion to the distance of the nebulæ at a rate of 550 kilometres per second per megaparsee (1 megaparsec = 3.26 million light years) and, as the law of general uniform expansion is that every object recedes at a rate proportional to its distance, this is taken as direct observational evidence of a general uniform expansion of the universe. But, in reaching this conclusion, the assumption is made that the nebulæ have been moving with the same velocities for at least 150 million years. Light that left a faint nebula in Gemini 150 million years ago tells ua that it was receding from us then at 25,000 kilometres per second, but is it necessarily receding at that rate now ? Our observations on nebular velocities extend over a long time range. Is it not possible to assume that the variations in observed velocities are variations with time and not with distance ? Assuming constant nebular velocities, the relation between distance and velocity is given approximately in the following table:
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