And why do people assume time is linear? Why can we remember the past but we cannot remember the future?
It does seem to be quite linear though, on the face of things. But that might just be because it is how we perceive it, or it may be that the process that brings forth ourselves, and our awareness is intrinsically bound to interpreting the cavalcade of events without our lives as such. Not that there aren't other ways to look at it out there..
Time is relative. If you get into a spaceship and travel at close to the speed of light for one year, when you return, only one year will have passed for you yet 1300 years will have passed on Earth.
Something that is not commonly recognized, both the past as well as the future are artifacts of the present. The past becomes past by emerging from the present rather than the present emerging from the past, just as all considerations of the future occur in the present. Time may expand so to speak, both forward and backward simultaneously from now.
Pac-man says- It don' matta where you go noth est suth o wes, we all stuck in the same time in the same rectangle.
It seems a mental construct to me, I don't know if that makes it an illusion. I imagine the farther forward we reach the farther back we go, like looking at distant stars.
That is certainly an interesting way to look at it, I will ponder that thought while I am asleep for the next 6 hours, and report back to you in the future, or the present as it will be at the time.
According to Einstein time speeds up or slows down depending on how fast you're going. Here's link that explains it better. http://www.pbs.org/wgbh/nova/einstein/hotsciencetwin/
gravity has the same effect. time is a dimension along which change occurs that wikipedia article was great though.
Time is not real. Its a concept we came up with to enforce order on an illusion of repetition (the sun rising every morning, setting every night, etc.).
The future and past are nothing more than imaginary concepts of the human brain. They do not exist without an observer capable of memory.