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A fact from Tom Bolton (astronomer) appeared on Wikipedia's Main Page in the Did you know? column on 12 July 2008, and was viewed approximately 1111 times (disclaimer)(check views). The text of the entry was as follows: "Did you know
The word 'irrefutable' in the first sentence is too strong. As I remember it, the work of Bolton and that of Webster & Murdin was regarded as making it very likely that the unseen companion of Cygnus X-1 was a black hole, but as not proving it. They were unable to exclude the possibility that the binary system was oriented in such a way that allowed the unseen companion to be a neutron star. This loop-hole wasn't closed until the 1990's when the X-ray novae V616 Monocertotis (A0620-00) and V404 Cygni were shown to have unseen companions that were definitely too massive to be neutron stars. TristramBrelstaff (talk) 20:26, 12 July 2008 (UTC)