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Originally Posted by OPVerma
THE Rate of the Expansion of the Universe has been a subject matter of controversy for a long time.
SCIENTISTS have determined the Rate of the Expansion of the Universe to be 67 km per second per megaparsec. This figure represents expansion ( km ) in one direction say lengthwise only. Actually the Universe is expanding in three directions- length, breadth, and height or volume wise.
So Rate of the Expansion of the Universe should be measured in three directions and presented as length (67 km) X Breadth ( ... Km ) X Height ( ... Km ) per second per megaparsec. Or ... Cubic Km per second per megaparsec. This approach would give the correct figure and help in ending the controversy.
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When they say 'accelerating rate of expansion' they mean the increasing speed at which galaxies move away from each other, which is
not a measure of volume.
If we hypothetically reverse the rate, then the galaxies would move closer together, slowing down rather than accellerating - just like running a film backwards - If that calculation is used, the galaxies would form a singularity in 13.7 billion years. So, the universe is 13.7 billion years old, or more precisely, the big bang occurred 13.7 billion years ago.