Can you travel in time?
Time Travel is a science fiction concept, outside the confines
of a traditional fourth dimensional SpaceTime frame of reference.
The basis for the concept of Time Travel comes in a number of
forms. The most common basis for Time Travel is the caricatural
notions of a Past, Present, and Future within SpaceTime. Since Time
is affected by any change in the Space (or consequently by any
change in the SpaceTime continuum), then Present Time is considered
to be a static snapshot of a singular SpaceTime event that defines
the existence of our reality. That is to say, both Past Time and
Future Time are outside the realm of the existence that defines our
reality. Each Present Time event predetermines the next Present
Time event. This predetermination is a result of cause and effect;
i.e. each Present Time event (or current SpaceTime configuration)
has a characteristic potential (or momentum) for its next Present
Time event (or next SpaceTime configuration).
Another basis for Time Travel is the relativistic notion of
Special Relativity, whereupon a positive mass is accelerated and
its measure of Time is warped by its distorted Space.; i.e. the
greater the positive mass density, the slower the measure of Time.
This has been demonstrated via atomic clocks at varying ranges of
gravitational acceleration; i.e. the greater the mass, the slower
the rate of time as recoded on the clock. Ergo, the rate of time on
Jupiter is slower than the rate of time on Earth. From this
postulate, it has been mathematically presented that by increasing
the rate of acceleration, the measure of Time can be stopped; i.e.
the hypothetical gravitational singularity of a black hole would
cause the rate of measure time to stop. Unfortunately, this notion
of Time Travel is an illusion of time dilation aging; i.e. the time
traveler can only exist in Present Time event, but is expected to
be still younger than those not affected by time dilation. This is
all still theoretical, as the concept of decreasing acceleration
(from a time dilated state due to increased acceleration) has no
comparable hypothesis, leading some scientist to believe that time
dilation would balance out.
Note: Time Dilation, via the theory of general relativity, is an
actual difference of elapsed time between two events as measured by
observers either moving relative to each other or differently
situated from gravitational masses. To simplify, velocity and
gravity each slow down time as they increase. Velocity has
increased for the astronauts, slowing down their time, whereas
gravity has decreased, speeding up time (the astronauts are
experiencing less gravity than on Earth).
In physics, the twin paradox predicts the effect employed
by the general theory of relativity. If one of a pair of twins
remains on earth, and the other travels in a rocket at a speed near
the speed of light, the traveling twin will be younger than the
earthbound twin upon returning to Earth. This effect has been
verified experimentally by measurements with atomic clocks.
The answer above hints at a fantastic and wonderful plan:
Let's assume that you are physically, mentally, and genetically
prepared to live,
let's just say, to the age of 75 years.
Now, if you could just get to Mars somehow, where the year is
almost twice as
long as the year on Earth, then you would live almost twice as
long there before
you turned 75.
I say let's get NASA funded again and let's give it a go !
no. Not actually. Travelling in time is not actually travelling
from 2012 to 2013 or 2011.
The time may not be the same at all parts of the universe. You
are calling 365 days
as 1 year depending on the rotations of earth. So if you spend
time in some other
part of the universe and come back after some years, you may
look younger or
older than expected. Your friends may feel that you travelled in
time. But its not
like you can go back and see Albert Einstein or enter the future
to see your grand