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Birth
Stephen Hawking was born in the eight of January 1942 in Oxford -
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Singularity theorem
In his work, and in collaboration with Penrose, Hawking extended the singularity theorem concepts first explored in his doctoral thesis, which included the existance of singularities and that the universe started as a singularity. -
Proof that the universe obeys general theory of realitivity.
In 1970, they published proof that if the universe obeys the general theory of realitivity and fits any of the models of physical cosmology created by Alexander Frieldmann, the it must have begun as a singularity.