And just for now, we really don’t have that technology which
can take our physical body on a trip to past.
But CAN WE SEE PAST ?
Well, If you ask me
to just ‘see’ past ?
Then YES, I have a way.
I’m not sure it works or not, but let’s make a try.
PLEASE CORRECT ME IF YOU FIND IT WRONG !
First of all let me clear that we don’t need a huge
machinery to just peek into the past.
So what we need ?
Don’t worry, We just need a huge a very huge Mirror !
Yes, you’ve heard right - Mirror.
And What else we need ?
A light source, we have Sun for this job. Cause we can see
things because of reflection of light back into our eyes.
And finally and most important – Distance.
Distance between the mirror and the observer is proportional
to the time difference between the event and its observation.
In simple words, more is the distance, more you can see the
past !
Now all set, let’s start our experiment...
Here is an Event happening on Earth, and we have set a HUGE
mirror on Moon.
As we know, distance between Earth and Moon ‘d’ = 384,400 km = 384400000 m/s , and speed
of light ; c = 299792458 m/s ~3 x 10^8
m/s .
As, Time = Distance/Speed ;
and Speed of Light ‘c’ is constant, then -
- For the Event happening on Earth, then light rays
associated with that event reach the mirror in time ‘T1’. Let them call
incident rays ‘i’.
- Reflected rays ‘r’ returning back from the mirror take
time ‘T2’ to reach to the observer’s eyes.
- As because speed of light ‘c’ is constant and distance
between Earth and Moon ‘d’ is the same.
Thus, T1 = T2 .
- So total time difference between the Event and the
Observation ‘T’ = T1 + T2 .
So from the calculations, we have T1=T2= 1.28 sec.
And T = 2.56 sec.
CONGRATUALTIONS ! You’ve just seen which had happen 2.56
seconds before. i.e, More the distance, more the time delayed, more you can see
the past !