Ravenbyrne
Registered user
A little birdie told me it is your Birthday today, so Happy Birthday 











A little birdie told me it is your Birthday today, so Happy Birthday![]()

Happy Birthday, Gerry 




Feck off - me birthday is the day after tomorrow.
I know the universe is heading for oblivion but don't be rushing it.
P.S. Is there only one universe.
Certainty is the enemy of progress or so I suppose.![]()


.................Is there only one universe.
...............

......... will your birthday be earlier or later......

Than what?
Unanserable - given the current impossibility of reconciling relativity and quantum theory. What is Space-Time?. Alas, there is no answer, at least not for now, and maybe never. Why does the universe appear to have one time and three space dimensions? In other words, what are space and time, and what is the strange combination of Space and Time that is the Spacetime Continuum? Spacetime continues to be one of the great scientific mysteries of the universe.
There is an underlying fundamental question we have never answered, it is best illustrated by asking - if we travel to the end of the universe and find a brick wall, what is behind the wall? Is our universe inside a walled "container" that allows us to measure distances from points on the fixed surface of the container. Or is our universe the container itself with nothing beyond the boundaries? If so there is no fixed background we can use to measure time and space. General relativity favors a background free universe where distance and time are measured by relative positions of objects in our universe, so that in a real sense what time it is depends on which object we are standing on when we ask the question. Quantum Theory favors a fixed background that pretty much lets us say exactly where we are at a given time.
Are all the (measurable) dimensionless parameters that characterize the physical universe calculable in principle or are some merely determined by historical or quantum mechanical accident and incalculable? What is the fundamental nature and origin of all the numbers that describe our universe, including space-time? It is clear that human beings cannot go beyond what science calls boundary conditions, yet it may also be impossible for us to answer questions about the most fundamental physical nature of our observable universe.
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