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Hubble's law
(redirected from Cosmological redshift)

    Also found in: Encyclopedia, Wikipedia 0.04 sec.

Hubble's law

Law that relates a galaxy's distance from us to its speed of recession as the universe expands, formulated in 1929 by US astronomer Edwin Hubble. He found that galaxies are moving apart at speeds that increase in direct proportion to their distance apart. The rate of expansion is known as the Hubble constant. Its currently accepted value is about 70 (km/s)/Mpc (70 km/s per megaparsec, or about 21.5 km/s per million light-years).



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? Mentioned in ? References in periodicals archive
 
Is it absurd to imagine that they might be slightly stretched or compressed as well, that the cosmological redshift might act differently on different wavelengths?
Constant comment. (Letters) by Kusnick, Gregory / Science News
In the usual interpretation of cosmological redshift -- a well-known effect in which light from a rapidly receding source appears redder than it would had it remained at rest -- the greater the shift, the greater the object's distance from an observer.
Enigmas of the sky: partners or strangers? by Cowen, R. / Science News
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