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Mass has momentum while light does not. So we cannot use a bullet to describe light. A photon is a wave of energy not a particle of mass.
We view stars and galaxies in there past positions. We view trees in their past positions but light is so fast it is indistinguishable. Remember we measure by light. A measurement cannot be accurate if you measure with the thing you are measuring. On to the relevance of trajectory. Photons are not part of mass in relativity. Virtual photons are hf as a sphere moving away from the sun. With the earth and sun moving, perpendicular vectors are not possible to view with light being independent of the source (postulate of relativity). So the vector of light hitting the earth from the sun leaves the sun in a forward vector to meet the position the earth will be in to receive the light from the sun. In the eight minutes and 20 seconds the light takes to reach the earth the sun has physically moved forward from its position when the light first left the sun. So we can never view an object where it physically occupies space and all objects are moving through space.
thebox, How would you describe color to a color blind person?
[quote/]I would first mention the difference of shapes ,[\quote]All mass objects are in a different place than viewed. With speed we only view their past position.[quote/][ then I would go on to discuss brightness levels and the difference in levels][\quote]Since we only view an object from a past position the angle of view creates a contracted view. This in no way affects the physical size.[quote/][ I would then explain to them that what they see black and white, is not necessarily black or white, other people see it to be colours and different like the shapes. ][\quote]What we view is not necessarily where it exists. Other people see it through relativistic eye's and know the physical position is different from the physical view. No star is where we view it in the universe.[quote/][I would then go on to explain how light works showing them the different wave lengths and explain they are colour blind. ][\quote]A light image moves at the speed of light to reach your eyes. Your eyes do not go to the image at infinite speed. You are relativisticly blind.[quote/][But to describe colour itself, would be rather difficult, I would have to compare it some way to being different than just black or white][\quote]Light is like sound going through air at 760 miles per hour. When you hear the sound of an airplane you first look behind the actual position of the plane. The sound and the physical position seem to be disjointed. Understanding the nature of light is what relativity is about.
No past or future exits , only the now exists and memories of past.
And of course you completely ignore the direct, very clear line of sight in your reply. ignoring the clarity of space itself will always return an incorrect answer or thought.
It is very factual that we can observe the start of lights journey from A to B and the end of lights journey from A to B simultaneously in one reference frame of a visual picture in the brain. Because of this very fact WE must consider the infinite speed of sight and that the Universe is all at present, the now. How can it be possible to observe an object in it's past geometrical position when it is factual we see the object at the same time we can see ourselves?
Also you ignore the third observers ''clock'' , timing your events from A to B , observing you and the light from A to B. Here you go , do all the time comparisons, stop thinking in 1d and 2d. - The diagram shows all observers observe each other at the same time.