Article: LETTER:The Big Bang and why our universe may not be alone

Sir: Infinity is hard to visualise, but impossible to deny. In infinite space-time, our universe, all 1.5bn light-years of it is, in human terms, less than a speck of dust existing for the blink of an eye. It is improbable - to me, inconceivable - that space-time was empty until the Big Bang happened and that our universe is its sole occupant. If conditions were right for the Bang to happen at one instant of space-time, the probability must be high that it was also right at other spaces and times. Infinite space-time should be littered with the results of other Big Bangs. If so, where is the evidence?

One possibility is that space-time has been filled with matter of the kind that wakes up ...

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