An alternative to the Big Bang theory is the big bounce which hypothesises the universe expands until it can expand no more, before crashing back into one infinitesimally small point in a cycle which repeats for eternity. If the Big Bang is true, it would mean that time as we know it started at a single point 13.8 billion years ago. However, if the Big Bounce theory, which is a cyclic model meaning it is part of a broader cycle, is correct then it would mean that time did not have a beginning, but rather has the ability to flow in all directions and has been doing so for eternity.<\/p>\n
As the Universe begins to shrink back into itself, some physicists believe time will also run backwards.<\/p>\n
This twin Universe, as Louisiana State University physicist Parampreet Singh puts it, existed before the Big Bang where it was a mirror image of our own cosmos and everything ran in reverse.<\/p>\n
Mr Singh said: In the universe before the bounce, all the general features will be the same. It will follow the same dynamical equations, the Einsteins equations when the universe is large.<\/p>\n
Further, the matter content will be the same, and it will have the same evolution. Since the pre-bounce universe is contracting, it will look as if we were looking at ours backward in time.<\/p>\n
In other words, when the Universe expands, time runs forwards, but when it contracts, time runs backwards.<\/p>\n
The Universe expands due to dark energy a mysterious substance in the cosmos which effectively counters the effects of gravity.<\/p>\n
However, as the cosmos grows, dark energy will become more sparse, which could theoretically allow gravity to win the battle.<\/p>\n
At this point the Universe will begin to contract down to an infinitesimal point.<\/p>\n
READ MORE:Big Bang theory wrong? Aliens created universe'<\/p>\n
Its not clear how exactly to test either of these scenarios.<\/p>\n
The Big Bounce theory was first popularised in 1987 when it appeared in German science journals, with physicists using it as a way to explain the problems with the Big Bang, such as where it came from or to remove the problematic singularity.<\/p>\n
The only other time in the Universe where a singularity occurs and the laws of physics are thrown out of the window is at the event horizon of a black hole, which is also unexplainable by current scientific methods.<\/p>\n
However, other experts believe the Big Bounce theory does not stack up, claiming there is little evidence to support his hypothesis.<\/p>\n
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Big Bang Theory shock: Time had no beginning and eventually reverses towards Big Bounce - Express.co.uk<\/a><\/p>\n","protected":false},"excerpt":{"rendered":" An alternative to the Big Bang theory is the big bounce which hypothesises the universe expands until it can expand no more, before crashing back into one infinitesimally small point in a cycle which repeats for eternity. If the Big Bang is true, it would mean that time as we know it started at a single point 13.8 billion years ago. Continue reading