Einstein ring sets puzzle for astronomers

Dickson, David; Thwaites, Tim
July 1991
New Scientist;7/20/91, Vol. 131 Issue 1778, p18
Cites an article in the July 11, 1991, issue of 'Nature' magazine which reported that radio astronomers have found a distant radio source with features which could help determine how big and how old the universe is. Einstein ring-like characteristics of the radio source; Details of earlier discoveries of Einstein rings; Observations made by the astronomers about the radio source.


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