Astrophysicist can tell you all about this, but I wonder if you ever considered time and space as a nuisance? After all, space is a distance you must pass between getting from here to there, and time is just a hindrance from being complete and whole. The future is anticipation of something either good or bad and the past is something to continually process and incorporate into our present.
Either way, the past and future seem to escape us, from distant memories to some event occurring in the future we are waiting and hoping to cope or manage whatever the future would throw our way. Usually the future does not materialize in any way or shape the way we imagine it. If you seriously contemplate these, neither past nor future exists. They are all in your mind. When the future becomes real is when it is NOW. This is what Eckhart Tolle managed to come up and create not one but two books from it. He became a walking industry of the NOW. This is a good thing, because he explains very complex and difficult subjects rather well. He however did not go far enough in explaining how the ancient laws of Karma and Reincarnation fit into his thesis.
Consider the linear nature of reincarnation, (we continually born/die/and reborn in time).
If this is true then space and time is real. If space and time is not real, then reincarnation does not exist. If you have a true, bone fide, out of body experience via meditation or otherwise you then experience timeless existence. People often come back from these journeys and make predictions and prophecies, usually with dismal results. Only Edgar Cayce had a decent track record of predictions and the source of his record is not known to me as of yet. The reason others cannot predict and tell what is coming because even if they have a glimpse of the unrealized event in our formed based “reality”, they have no time when they have a vision of that. Hence, predictions are unreliable, especially when they deal with dates and time (such as the 2012 prediction).
A while ago, I have asked my teacher whether humans could ever incarnate backwards in time? His answer was, no, because the illusionary nature of time and space. Reincarnation, as we understand it, is also illusionary. It is all in the context of our limited, form based reality which is obviously, just the tip of the iceberg.
The ultimate reality is oneness and it knows no boundaries of space and time, when we experience rebirth and the laws of Karma it is akin to experiencing a dream within a dream. It is only real in the frame of our temporal existence, not the boundless and infinite.
This universe and all other universes are just the mirrored images of the infinite, what takes place in the mirror also takes place in the infinite except it is different from the mirrored reality. The mirrored reality, as we know it, has polarity.
As above so is below. (old Hermetic saying)
IN our temporary, form based existence nothing is absolute; all concepts are in existence from a polarized, subjective world.
Good only exists because there is Bad, the Light can only exist because there is Darkness. Our mind, as we have it cannot comprehend what infinity could be where there is no polarity, no time and space and there is no fragmented self. Humanity, all the six billion of them exists in a collective consciousness as one and the separation from infinity is no more.
What does this all mean to you? It is helpful to put things in context, just because karma and reincarnation are not as real as you were once lead to believe, it does not mean that you should not abide by the rules of conduct they imply. When you convince yourself that time and space is not the ultimate reality, including the laws of gravitation, you still should not leap off the tallest building.