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between 13-15 billion years ago
the big bang is a titanic explosion that created energy matter space and time.
The Big Bang Theory is the leading explanation about how the universe began. At its simplest, it says the universe as we know it started with a small singularity, then inflated over the next 13.8 billion years
the big freeze is that the universe is massive enough to over power gravity in this case it will expands forever
it starts when all stars will die in approx 1014 (100 trillion) years.
the matter of the universe, from stars and galaxies to atoms and subatomic particles, and even space time itself, is progressively torn apart by the expansion of the universe at a certain time
the theory states that universe will not continue to expand forever.
the big crunch is a station that scientists predict will happen.
According to the standard Big Bang model, the universe was born during a period of inflation that began about 13.7 billion years ago. Like a rapidly expanding balloon, it swelled from a size smaller than an electron to nearly its current size within a tiny fraction of a second.
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