Chinese-Dragon
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Ok, one simple question.
How can you measure the flow time without looking into any clock, or sun?
Hard to say.
According to general relativity, Gravity also stretches time, so that could be a problem as well.
I'm not a scientist, but I have read that the extreme gravity at the centre of a black hole will slow down time so much, that time will essentially come to a standstill.
Near a black hole, the slowing of time is extreme. From the viewpoint of an observer outside the black hole, time stops. For example, an object falling into the hole would appear frozen in time at the edge of the hole.
http://www.cfa.harvard.edu/seuforum/bh_whatare.htm
Of course, if you were that close to the singularity, you would have been turned into spaghetti already.