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The fabric of space BETWEEN the galaxies is supposedly expanding, but not within the galaxies.
Originally posted by Frakkerface
So the big bang happened and everything started to fly away from the central point. This is the part that I'm curious about, when science talks about expansion, is it only the galaxies moving apart that are supposed to be expanding? I ask this because I sometimes get the impression that the fabric of space itself is expanding.
We don't, and there is some debate about that. The Observable universe is a sphere a little over 13 billion light years in diameter, but due to the expansion of space uring the last 13 billion years, it's believed that objects where the light took 13 billion years to reach us are considerably farther than that now due to the expansion of space:
But if the fabric of space was only created by the big bang then there must be a boundry, an end point but what would that be, what is space like when it stops being space?
How do we know that space doesn't go on eternally and just the matter has reached a certain point?
The age of the Universe is about 13.7 billion years, but due to the expansion of space we are now observing objects that are now considerably farther away than a static 13.7 billion light-years distance. The edge of the observable universe is now located about 46.5 billion light-years away, giving an observable diameter of 93 billion light-years.
The figures quoted above are distances now (in cosmological time), not distances at the time the light was emitted.
78 billion light-years. This is a lower bound for the diameter of the whole Universe, based on the estimated current distance between points that we can see on opposite sides of the cosmic microwave background radiation (CMBR).