I should probably warn you at the very
beginning: There are times when my mind
journeys into extremely untraveled roads.
This means that I am going to “throw out” some wild ideas within this
blog post. I’ll give you my opinions on these
topics and maybe you can compare them to your thoughts on the subjects. I’m not going to cover ALL the topics that I
think about in this blog. I have to save
some of the topics for future discussions, so I’ll only discuss TWO here. Let’s get started!
INVISIBILITY
I think maybe all of us,
at one time or another; have had thoughts about having the ability to be
invisible. No one would be able to see
us and, no doubt, we have thought up some pretty interesting circumstances in
which this ability would be very useful (or enjoyable)!
But have you given any serious
consideration to what would have to be involved in having this ability? And what really is invisibility? Consider the quality of site itself: We “see” because of the ability of objects to
reflect light. What does this mean?
Your eyes are organs in
your body that detect light, which allows you to see by sending signals to the
optic nerve and other areas of your brain.
Eyes do not actually see, but they are the medium we use to see
through. When rays of light enter our
eyes, it excites the nerves and sends that message to the brain. The brain is then able to compute what the
eye is seeing. Through the eye, we can
see darkness, brightness and different colors.
When you vary the intensity of the light, you are able to distinguish
between colors.
For the eye to be able
to see, light has to pass through the cornea and reach the retina. The retina is the light-sensing structure in
the eye. When light hits the retina a chemical
forms that causes an electrical impulse in your optic nerve. The electric impulse is transmitted to the
brain and is interpreted as light. The brain
is able to understand these signals, which allows you to see images.
Your eyes can only see
some light. There are many more
wavelengths of light that the human eye cannot see.
Some birds, particularly geese and other waterfowl can see some strange
types of light called polarized light, and recognize it distinctly as
reflections from calm bodies of water far below.
The spectrum, or the
rainbow, displays for you the colors we can see, which are: red, orange, yellow,
green, blue, indigo, and violet. Other light sources we can’t see include such
things as infrared and ultraviolet, although there is a fluorescent lamp known
as a “black light” which produces ultraviolet, and the bulb glows visibly, it
isn’t really the ultraviolet rays you see, but re-emission in visible
wavelengths that are within the visible range of wavelengths. And possibly there are other light sources that we as humans are unable to see.
So, if you could “reflect”
a light wavelength that was undetectable by the human eye you would be “invisible”
to all humans. This would still bring
into question additional consequences to be considered. If you reflected NO visible light would
people looking in your direction “see” a blank space or would the light of the
objects behind you “bend” around you so that a person would see those things
instead of you? And when you moved would
a person “see” a “ripple” effect moving across the landscape? Also, although you would “appear” to be
invisible, would you in fact still be “solid”, so that you might “bump” into
things or have people “run into you?”
You can understand how complicated this ability might be in
actuality. We noted earlier that some
animals see light waves in a different frequency than we do. So would they, perhaps, still be able to “see”
you? Also, if a person had some type of “vision
problem” might they be able to “see” you even though others could not? This question alone may lead us into another
area of discussion later. Let’s look at
another area as we go deeper into the corridors of my mind.
TIME TRAVEL
Who hasn’t thought about
the ability to return to the past and “change” some of the things that have
happened in their life? This desire for
change could be because of something we DID and have come to regret it, or it
could be to perhaps DO something we had originally failed to do and now we look
back with regrets on that lack of deciding or taking action. Whichever the case, could we actually return
to the past and “change” specific aspects of our lives or maybe the lives of
others? And if we did: What would be the
resulting consequences of such actions? I’d
like to share MY thoughts on the subject.
I don’t know if they are all “scientifically” accurate or not, but this
is what comes out of the deep recesses of my mind.
First is time travel
even a possibility? One of the best (in
my humble opinion) discussions of the reality of time travel was presented in
an article (updated Sept. 1, 2016) by Andrew Zimmerman Jones. I would like to quote the entire article
below.
“IS TIME TRAVEL POSSIBLE?
Stories regarding travel into the past
and the future have long captured our imagination, but the question of whether
time travel is possible is a thorny one that gets right to the heart of
understanding what physicists mean when they use the word “time.”
Modern physics teaches us that time
is one of the most mysterious aspects of our universe, though it may at first
seem straightforward. Einstein revolutionized
our understanding of the concept, but even with this revised understanding,
some scientists still ponder the question of whether or not time actually
exists or whether it is a mere “stubbornly persistent illusion” (as
Einstein once called it).
What is the Theory of Relativity?
Whatever time is, though, physicists
(and fiction writers) have found some interesting ways to manipulate it to
consider traversing it in unorthodox ways.
Time and Relativity
Though referenced in H.G. Wells’ “The
Time Machine” (1895), the actual science of time travel didn’t come into being until
well into the twentieth century, as a side-effect of Albert Einstein’s theory
of general relativity (developed in 1915).
Relativity describes the physical fabric of the universe in terms of a
4-dimensional space-time, which includes three spatial dimensions (up/down,
left/right, and front/back) along with ONE time dimension. Under this theory, which has been proven by
numerous experiments over the last century, gravity is a result of the bending
of this space-time in response to the presence of matter. In other words, given a certain configuration
of matter, the actual space-time fabric of the universe can be altered in significant
ways.
One of the amazing consequences of
relativity is that movement can result in a difference in the way time passes,
a process known as time dilation. This is
most dramatically manifested in the classic Twin Paradox. In this method of “time travel” you can move
into the future faster than normal, but there’s not really any way back. (There’s a slight exception, but more on that
later in the article.)
Early Time Travel
In 1937, Scottish physicist W.J. Van
Stockum first applied general relativity in a way that opened the door for time
travel: By applying the equation of general relativity to a situation with an infinitely
long, extreme dense rotting cylinder (kind of like an endless barbershop
pole). The rotation of such a massive
object actually creates phenomena known as “frame dragging,” which is that it
actually drags space-time along with it.
Van Stockum found that in this situation, you could create a path in
4-dimensional space-time which began and ended at the same point – something called
a closed time like curve – which is the physical result that allows time travel. You can set off in a space ship and travel a
path which brings you back to the exact same moment you started out at.
Though an intriguing result, this was
a fairly contrived situation, so there wasn’t really much concern about it taking
place. A new interpretation was about to
come along however, which was much more controversial.
In 1949, the mathematician Kurt
Godel – a friend of Einstein’s and a colleague at Princeton University’s
Institute for Advanced Study – decided to tackle a situation where the whole
universe is rotating. In Godel’s
solutions, time travel was actually allowed by the equations … if the universe
were rotating. A rotating universe could
itself function as a time machine.
Now, if the universe were rotating,
there would be ways to detect it (light beams would bend, for example, if the
whole universe were rotating), and so far the evidence is overwhelmingly strong
that there is no sort of universal rotation.
So again, time rtavel is ruled out by this particular set of
results. But the fact is that things in
the universe do rotate, and that again opens up the possibility.
Time Travel and Black Holes
In 1963, New Zealand mathematician
Roy Kerr used the field equations to analyze a rotating black hole, called a
Kerr black hole, and found that the results allowed a path through a wormhole
in the black hole, missing the singularity at the center, and making it out the
other end. This scenario also allows for
closed time like curves, as theoretical physicist Kip Thorne realized years
later.
In the early 1980s, while Carl Sagan
worked on his 1985 novel Contact, he approached Kip Thorne with a question
about the physics of time travel, which inspired Thorne to examine the concept
of using a black hole as a means of time travel. Together with the physicist Sung-Won Kim,
Thorne realized that you could (in theory) have a black hole with a wormhole
connecting it to another point in space that could be held open by some form of
negative energy.
But just because you have a wormhole
doesn’t mean that you have a time machine.
Now, let’s assume that you could move one end of the wormhole (the “movable
end”). You place the movable end on a spaceship,
shooting it off into space at nearly the speed of light. Time dilation (see, I promised it would come
back) kicks in, and the time experienced by the movable end is much less than
the time experienced by the fixed end.
Let’s assume that you move the movable end 5,000 years into the future
of the Earth, but the movable end only “ages” 5 years. So you leave in 2010 AD, day, and arrive in
7010 AD. However, if you travel through
the movable end, you will actually pop out of the fixed end in 2015AD (since 5
years have passed back on Earth).
What? How does this work?
Well, the fact is that the two ends
of the wormhole are connected. No matter
how far apart they are, in space-time, they’re still basically “near” each
other. Since the movable end is only
five years older than when it left, going through it will send you back to the
related point on the fixed wormhole. And
if someone from 2015 AD Earth steps through the fixed wormhole, they’d come out
in 7010 AD from the movable wormhole.
(If someone stepped through the wormhole in 2012 AD, they’d end up on
the spaceship somewhere in the middle of the trip --- and so on.)
Though [this is] the most physically
reasonable description of a time machine, there are still problems. No one knows if wormholes or negative energy
exist, nor how to put them together in this way if they do exist.
But it is (in theory) possible.”
This subject too brings
up so many additional questions. If you
traveled into the future to a point where you no longer existed, what would
happen? Could you travel to the past to
a point where you didn’t exist, what would happen? Or perhaps there is a “limitation” of such
travel that would prevent you from traveling outside your own lifetime. If that were the case, and you did indeed
travel to such a time (especially the past) would there be TWO of you? And who really knows what other questions
this development may create if it became a reality and what consequences may result
from such travels?
Some times I can let my mind wonder
to the unbelievable possibilities of “what if?”
But, as with ALL things we must exist in the present: In the reality that we have created by
choices, and let the realness of the impossible (or the highly improbable)
remain in the recesses of our minds.
QUOTE TO CONSIDER
THOUGHTFUL GEM
"Really - - -
If you knew the future,
would you do anything different?"