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عمومی::
زمان پلانک
This very short time is called the "Planck time," and is a fundamental length of time in physics.
In essence, the Planck time is the shortest period of time that any physical process can happen in and still be described in terms of our usual notions of space and time.
, -0.000001), then the universe would have lasted for a thousand Planck times, namely about a ten-thousandth of a bil- lionth of a billionth of a billionth of a billionth of a second.
If it had been positive and not too large or small, say about +1, then the universe would have undergone an incredible "exponential" expansion, in which it doubled in size every ten-millionth of a billionth of a billionth of a billionth of a billionth of a second-that is, in every Planck time.
For example, we cannot know exactly how long the universe had to last for life to have time to evolve, but we do know with virtual certainty that it had to last much longer than a "Planck time" (i.e.
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