Yes Arnold, time does exist in space...but not as we are aware of it...minutes and seconds etc, this bit is Man-made.
Time is recently defined as the arrow of evolution, as such it is theorised that this arrow can be in 2 directions, whereas we only percieve time as a one-direction arrow as we live our finite lives...one way !!
Greene postulates that within the Universe, on a quantum scale there are places where time would seem to us to go backwards, where a broken egg would reconstitute itself perfectly...this is quite probable Mathematically (!!!!) At the micro level (quantum) the Universe is seriously chaotic, all things exist as probability waves.,......hence Heinsenberg's Uncertainty Principle..."the very act of observing something, by definition will change it !!!" To go further, there exists at any time an infinite variety of times and things, it is only our observing of them that jumps them into reality.
Look at the Moon, close your eyes...where did the Moon go to
Intellectually, you know it is still there, but scientifically, you cannot prove it so. By looking at the Moon, you bring it into existence..............
For further headaches...read about the "Scroedingers Cat Parable "
...dead, non-dead, alive, non-alive !!!!!!
I think you are probably right about black holes, dark matter and such stuff...but I dont claim to know much about it. Apparently, the Great Attractor which pulls Galaxies into the shapes we observe is all about the sheer amount of matter being held somewhere within the Black Holes that are present at the centre of ALL Galaxies...ours included. Mass/matter thus produces/influences/creates Gravity, which is a very weak force...but there is a lot of it !!
Time in the Universe can only be referenced to the speed of light...not a clock !!! Light being the only vehicle we have of measuring evolution on a Galactic scale. Therefore to say that a Galaxy is 20 light years away, this defines both a time and a distance....we observe this Galaxy as it was 20 years ago !!! What has happened in this 20 years, we cannot see and cannot know...yet !!!
Makes you wonder about the Galaxies that are 1 million light years away.........what happened since
?