How is the size of universe calculated as 93 billion light-years when the total age of universe is 13.7 billion l-y, it means even light has got maximum 13.7 billion years to travel. Is the Hubble Expansion final answer to this or there are some other calculations also involved? If there are other calculations involved, then please let me know about that.
Inflation is the answer, the universe got 10^78 times more volume in 10^-32 seconds. Crazy, but it has passed all the test so far. Inflationary expansion was way faster than the speed of light! Special relativity says that information cannot move faster than the speed of light, but general relativity says things can move faster than the speed of light as long as no information is transmitted, basically the space between the light expanded, so the light was still moving at the speed of light, just the space around it was growing in dimension faster than the light was traversing it. In fact parts of the universe are likely still inflating. General relativity has also past all the tests, including very weird effects like frame dragging! Inflation and general relativity cover some fairly heavy math, more than can be easily shown here. So please look up these references ...
A. H. Guth, "The Inflationary Universe: A Possible Solution to the Horizon and Flatness Problems," Physical Review D, 23, 347 (1981)
Liddle and Lyth, Cosmological Inflation and Large-Scale Structure (2000)
Mukhanov, Physical Foundations of Cosmology (2005)
Pfister, H.,"On the history of the so-called Lense–Thirring effect," General Relativity and Gravitation 39, 1735–1748 (2007)
Yes, it's due to the space expansion (about 70 km/s/Mpc). I don't know of other explanations
See:
http://scienceblogs.com/startswithabang/2009/07/31/the-size-of-the-universe-a-har/
This is an explanation of the size of the observable universe. But for the size of the whole universe, it is at least 50 time bigger than that and some physicists speculate that it might be infinite.
Inflation is the answer, the universe got 10^78 times more volume in 10^-32 seconds. Crazy, but it has passed all the test so far. Inflationary expansion was way faster than the speed of light! Special relativity says that information cannot move faster than the speed of light, but general relativity says things can move faster than the speed of light as long as no information is transmitted, basically the space between the light expanded, so the light was still moving at the speed of light, just the space around it was growing in dimension faster than the light was traversing it. In fact parts of the universe are likely still inflating. General relativity has also past all the tests, including very weird effects like frame dragging! Inflation and general relativity cover some fairly heavy math, more than can be easily shown here. So please look up these references ...
A. H. Guth, "The Inflationary Universe: A Possible Solution to the Horizon and Flatness Problems," Physical Review D, 23, 347 (1981)
Liddle and Lyth, Cosmological Inflation and Large-Scale Structure (2000)
Mukhanov, Physical Foundations of Cosmology (2005)
Pfister, H.,"On the history of the so-called Lense–Thirring effect," General Relativity and Gravitation 39, 1735–1748 (2007)
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