Word: dimensionless
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Dates: during 1990-1999
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...still a graduate student, Hawking became fascinated by black holes, the bizarre objects created during the death throes of large stars. Working with mathematician Roger Penrose and using Einstein's relativity equations, he developed new techniques proving mathematically that at the heart of black holes were singularities -- infinitely dense, dimensionless points with irresistible gravity. He went on to demonstrate that the entire universe could have sprung from a singularity and, in his 1966 Ph.D. thesis, wryly noted that "there is a singularity in our past...