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" "A million million million million (1 with twenty-four zeros after it) miles, the size of the observable universe.
Stephen William Hawking CH CBE FRS (8 January 1942 - 14 March 2018) was a British theoretical physicist, cosmologist, author and Director of Research at the Centre for Theoretical Cosmology within the University of Cambridge.
Biography information from Wikiquote
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Quantum physics tells us that no matter how thorough our observation of the present, the (unobserved) past, like the future, is indefinite and exists only as a spectrum of possibilities.
The universe, according to quantum physics, has no single past, or history. The fact that the past takes no definite form means that observations you make on a system in the present affect its past.