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 Originally Posted by pocketfours
[...] scientists believe that time started simultaneously with the big bang [...].
A biologist is a scientist, but by no means an authority on cosmology.
Originally Posted by pocketfours
I'm assuming the theory stems from the observation that mass/gravity seems to slow down time.
It is definitely a consequence of Einstein's General Relativity. While this is a clever assumption, it could be better stated.
It is difficult to grasp that space and time are really tied together. Our human perceptions defy this understanding. We can move forward, backward or be still in 3 dimensions of space, but we can only move forward at a constant rate in time. This makes it seem like space and time are independent.
However, space and time are intrinsically related to each other. In fact, one can not exist without the other. There can be no time if there is no space; there can be no space if there is no time. There could be no way to observe either without both.
Always in statements of physics, we are confined to what can be observed. I can not speak to whether something which can not be observed exists (not as a physicist, at least).
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