I do not have much enthusiasm for the possibility of practical time travel. However, capturing light from the past or future to make an image may be a different story.
As we know, electromagnetic waves such as light radiate into space at right angles from the body of matter which produces or reflects the waves. As I described on my cosmology blog, there must be at least four dimensions of space, three of which we experience as space and one as time. But this arrangement is simply due to the configuration resulting from the throw pattern of matter in the Big Bang, which was the beginning of the universe as we know it.
There is no set rule concerning which one of the dimensions must function as the time dimension. It all depends upon the direction in which the bundles of strings composing our bodies and brains is aligned. We actually occupy all four dimensions of space, but matter which includes our bodies and brains is aligned mostly along one of the dimensions and we can only see at right angles to the present position of our consciousnesses so that we perceive this dimension as time and the other three as space.
It is when an object is in apparent motion that it extends, but usually only at a very slight angle, into the dimension of space that we perceive as time. It is only when an object is moving at what we perceive as the speed of light that it's time dimension becomes one of our spatial dimensions, depending on the direction in which it is moving, and our time dimension becomes one of it's spatial dimensions.
This means, as I described in detail on the cosmology blog, that the reason any object appears to us to be in motion is that we do not occupy the same dimensional set as our consciousness proceeds at what we perceive as the speed of light along the bundles of strings composing our bodies and brains, which are aligned along the dimension of space that we perceive as time.
There must be light, and other electromagnetic radiation, along the fourth spatial dimension, which is the one that we perceive as time. If everything in the universe remained perfectly still, then this would not be the case. But nearly everything in the universe is in constant motion in one way or another, even if we do not perceive it. We know that our earth rotates and revolves around the sun. Our galaxy also undergoes rotation at a significant portion of the speed of light and at the same time, the universe is expanding at a high rate of speed.
When an object is at rest, from our perspective, the light that it radiates is entirely in our three dimensions of space. But when the object is in apparent motion, relative to us, it's dimensional set is different from ours so that some of the light that it radiates goes into the dimension of space that we are experiencing as time.
The principle is the same as that of a sign that is facing you until it is turned partially away from you. The exposure can be expressed as the cosine of the angle of the sign relative to your perspective. The remainder of the light from the sign moves in a direction parallel to you so that you do not see it.
All objects can radiate or reflect light and other radiation. But because they do not share exactly the same space-time configuration due to relative motion, there must be light moving along the dimension of space that we perceive as time that we cannot see.
Light radiates at right angles to strings of matter, of which the predominant alignment is in one direction due to the throw pattern of matter in the Big Bang. but since virtually all matter is in some type of motion, plenty of light gets into the time dimension. This light runs parallel to the movement of our consciousnesses along the bundles of strings composing our bodies and brains so that we do not see it. If we only could see this light, we would be seeing backwards or forwards in time.
This means that if we could find a way to travel at what we perceive as the speed of light, meaning that the bundles of strings composing our bodies and brains was bent at a right angle, what had been the time dimension when we were at rest would now be one of the spatial dimensions and we would see into the past in one direction and the future in the opposite direction. But attaining the speed of light, or anything close to it, is simply not practical with existing technology.
But I got to thinking about what would happen if we could get a beam of light, travelling at the speed of light from our perspective, to somehow take a photograph.
We cannot practically travel anywhere near what we perceive as the speed of light so that we can see into time. We are only capable of bending the bundles of strings composing matter at a slight angle, which we perceive as low speed. But light, by it's very definition, moves at what we perceive as the speed of light.
When we send out a beam of light into space, it must interact with light that we cannot see because our beam's space-time configuration is different from ours by one dimension. Due to the fact that just about all matter is in some type of relative motion, it will radiate or reflect light into our time dimension that we cannot see.
When we send out the beam of light, it will not be perfectly perpendicular to virtually all light in our time dimension due to this universal relative motion. This opens the possibility that we could send out very finely-controlled beams of light and then form an image from the time dimension from the subtle modulations in the beam's frequency and amplitude caused by the otherwise undetectable light in our time dimension. It is, of course, vital that the beam not be modulated by any light parallel to it, or that we learn to cancel out any such modulations.
Electromagnetic waves, such as light and radio waves, can modulate one another. If it is desirable to beam a radio signal, rather than broadcasting it, dual antennas can be set up so that the waves undergo constructive and destructive interference. The signal is cancelled out in one direction and reinforced in a perpendicular direction. Two signals relatively close in frequency can also modulate one another to a median common frequency, this is the principle used in superheterodyne radio receivers.
I established that while our consciousnesses move along the bundles of strings composing our bodies and brains at what we perceive as the speed of light, we see toward the past direction at an angle of 45 degrees.
Light is two-dimensional, as we can see in the sine wave on an oscilloscope, and it requires two equal dimensions, or else we would see in one dimension of space more than another. The only way that we can see in two equal dimensions is to see at a 45 degree angle.
This is why we are looking 36 years into the past when we look at a star that is 36 light years distant. It is not that other light is not there, it is just that we cannot see it. For an explanation of why light must be two-dimensional, you can read "The Nature Of Electromagnetic Waves", also on this blog.
When we deal with time, we must remember that it does not exist in absolute reality but is only something that we perceive. This is why physics has gotten essentially nowhere in explaining the nature of time. Since it is something in our nature, it cannot be explained by the laws of physics alone.
The movement of our consciousness along the bundle of strings composing our bodies and brains is somewhat like an hourglass built with 45 degree angles. We see into the past at 45 degrees, which is why we see stars in time according to how far away they are in light-years. But when we undergo an action, we act at 45 degrees into the future because that is where the momentum of our consciousness is taking us.
When we shine a beam of light into space, we are actually shining it at 45 degrees into our future. This is why we can shine a beam of light into a mirror and have it reflected back to us. It actually reflects back essentially instantaneously but we do not see it until our consciousness, moving at what we perceive as the speed of light, reaches the point where the beam intersects back to our bundle of strings.
So, if we see at 45 degrees into the past, and a beam of light that we send into space is aligned at 90 degrees from that, at 45 degrees into our future, that means that light in space parallel to us, from the past dimension that we can only see at 45 degrees, will be aligned so that it intersects our outward beam of light at 45 degrees. If we could only capture that light, by having it modulate the beam of light that we have sent out, we could look directly into the past dimension instead of at the 45 degree angle.
Just think of a pulse of laser light as a spacecraft that will travel at what we perceive as the speed of light and get a view of the space-time configuration that differs from ours. There is, of course, really no speed of light. Our consciousness moves along the bundles of strings composing our bodies and brains at what we perceive as the speed of light and an object seen as moving at the speed of light is actually a string or bundle of strings bent or aligned at right angles to our bundle of strings.
The operation of the time camera is similar in principle to the amplitude modulation (AM) or frequency modulation (FM) of a carrier wave that is used in ordinary radio broadcasting. Upon reception, the carrier wave is removed so that only the signal which modulated that wave remains. Except that the time camera will use lasers. Lasers are already used extensively for communication, so that this is mostly existing technology.
A multitude of fine lasers of all visible colors (colours) will be beamed out into space to a reflector and then received back. Until the light reaches the reflector, unseen light from the past dimension will meet it at 45 degrees so that it will be modulated by the light that is of the same frequency.
With very finely-controlled laser light, we could separate out the minute variations in wavelength and amplitude induced by the light from the past dimension and actually glean a phtotograph of light from the past that we could not otherwise see. It is vital to use weak, low-amplitude lasers which can be noticably modulated by faint light.
On the return journey from the reflector, the laser light will be modulated by light from the future in the same way. To separate the past from the future, we could possibly have a copy of the signal sent back from the reflector by cable so that it is only modulated by light from the past, and not by the future. A fresh pulse of light, free of any modulation, could be sent back from the reflector so that it is only modulated by light from the future direction, and not from the past.
Remember that if we look into the future, we will see only inanimate matter because life, moving along in the frontier that we call the present, has not yet arrived there. For a further explanation see "The Consciousness Barrier" on the cosmology blog, with some parts still on the main blog.
Also remember that most of what we will see in a time photograph is space. Since the earth orbits the sun, we could see a series of earths, each one light-year behind the other. For practical use, the time camera will have to be coupled with an extremely powerful telescope. The photo should also be taken from space because otherwise, the earth itself may block our view. But whatever the practical value of the time camera turns out to be, it will certainly reveal new facts about the universe.
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