Time has many aspects. It's core purpose is defined by celestial events, and occurrences.
Time is the foundation to which our society built it's basic structure upon. Though time is a man made tool devised to measure distance, and purpose for functionality, we humans have developed this tool's skill to the point of messuring devine influence far beyond our own home planet Earth. And, in doing so provided for ourselves a looking glass, to which we can peer into an astronomical distance, and comprehend the demands of our intelligence to achieve further reaches into all demensions of time.
In ancient societies, time was a devining ability, and represented to the people the hope for the future, and the revealing of sins of the past, to not be repeated. Yet, so many centuries have passed, and we as a species with this great knowledge in tow, have failed to control ourselves enough to not repeat the mistakes of the past.
Time travel into the future and the past is all to real, and requires no machinery, black holes, or worm holes. We were created with the ability to travel time when our brains devised away to store a record of our own personal history . And, with one recalled memory, we are able to move a little further forward into the future. Where as, we are capable of seeing the occurrences of events that were brought on by a past action.
With each memory that plagues our brains we relive the past, and gaze with horror filled eyes into the future that can be, if we, ourselves do not stop repeating the mistakes that resulted in the past's, future once already visited. Humanity has gained great knowledge thanks to the concept of time, and it's possibilities to affect the future. ie...Humanity's obsession with future prediction.
If one wants to know what the future holds for them, all one has to do is look from where they are at that moment back through thier memories of transpired time, to see what the future hold's for them. The difficulty then arises as to what actions should be taken to alter the future from it's current path.
The ability of humans to manipulate time, as well as it's concepts, offers a wider view to which humanity may further our species evolution to greater heights. However, the misuse of the concept of time can also bring about the fall of an entire planet.
Within the concepts of time we implemented limits. Limits determined by cause, action, and resulting events, and in doing so provided for our own evolution a dual path. One that takes us far into the future, and one that ends, not only our species, but extiguishes the very life of our planet and all that inhabits it.
The delicate nature of Time, is the devining tool that predicts the fate of our galaxy, and our place in it. Hopefully, even beyond it.