Last updated on April 21, 2014 at 5:21 EDT
Seyferts Sextet NGC6027 and NGC6027A-E in Serpens
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Seyfert's Sextet, NGC6027 and NGC6027A-E, in Serpens

January 25, 2005
Seyfert's Sextet, a grouping of (as the name implies) six galaxies in the constellation Serpens, is an interesting example of a discordant redshift group. Five of the members show very similar redshifts, from 4000 to 4500 km/s, while the fifth is measured at nearly 20000 km/s. Conventional wisdom argues that this is a chance projection of a distant background galaxy: some would have otherwise and require a complete rethink of modern cosmology and the introduction of completely new physics.