Kok bisa berbeda,  cahaya itu gelombang elektromagnit apa bukan ?

BASIC CONCEPTS OF THE AETHER

http://www.sinequanonthebook.com/Concepts.html

..............To deny the ether is ultimately to assume that empty space has no physical quality whatever. [/b]The fundamental facts of (quantum) mechanics do not harmonize with this view...............according to the general theory of relativity space is endowed with physical qualities; in this sense, therefore, there exists an ether.According to the general theory of relativity space without ether is unthinkable; for in such space there not only would be no propagation of light, but also no possibility of existence for standards of space and time (measuring-rods and clocks), nor therefore any space-time intervals in the physical sense.

A Great Many Scholars Believe that“Ether” Exists
Shijia Yang


Moreover, there are a lot of scholars think that“ether” exists, for examples :

There is a parlance from Huang Xinwei : why we want to resume the concept “ether”?   The  speed of material particle is variable, why the speed of light is invariable? My viewpoint is: in order to explain the speed of light is invariable in an inertial reference frame, we must fill the vacuum of the inertial reference frame with a certain matter, otherwise, which cannot be justified.
Even if someone dislike the term“ether”, in order to fill the vacuum ,he have no choice but to introduce“field”, and so on, which are something have a change in form but not in essence, Even if anything would be introduced to fill the vacuum, but it have been admitted that the earth can drag partially a surrounding vacuum to influence the speed of light in which, no other than can explain a new optical phenomenon. In this circumstances, it would be better to restore “ether”,
present it with a new characteristic. For example, in the sake of explanation of photoemission, we must think over Property of particle of light.

Professor Wang Ruyong says: the complexity of the“ether”may be exceed our imagination.

Wang Fei says: The problem of velocity of light and the problem of “ether” are same problems in essence, if the problem of “ether”have not been solved, even if the problem of velocity of light have been solved by a experiment, which cannot be make clear essentially; Whereas, if the problem of “ether”is settled clearly, the problem of velocity of light will come to light. However,  in order to prove the problem of “ether”, We must use some experiments about the velocity of
light.

Hu Cangwei says: In fact, my model of ether and Sir Yang Shijia’s model of ether are like. I  think, the ether and real object are similar, is also made from some basic particle, the ether of the pure electromagnetism field is an ocean that make of pair of positive electron and negative electron.

Ye Bo says : the Magnetic Field is a whirlpool of the “ether”.
A web friend , his web name is 101 steps , in his viewpoint of locomotion, he says: The space is filled by the free electrons, light is a locomotion of the free electrons, velocity of light is a velocity of transferable force，the sporting direction of the electron will bend toward the direction with small resistance.
A web friend, his web name is jgr01234, he says: ether particle is made of pair of positive electron and negative electron.

In his thesis :“Research and Argue about Special Theory of Relativity” , Professor Huang Zhixun points out:《New Scientist》has made a news report, With a thesis“Theory of Ether Revives with a Hight-Sounding, Replace the Hidden Matter”in 2007, the article claim that G.Starkman and T.Zlosnik had been driving a explain of the hidden matter with a new fashion, this parlance means
that the Milky May galaxy contain more much substance then visible substance.

In their thesis :“the Hypothesis of conformation model of light medium , Zhang Yannian and Wang Qingjie point out: Transmitting light needs a light medium, the light medium has definite static mass and internal structure and definite distributing rule. The light medium includes a particle with positive electricity and an electronegative particle at least, they may be called positive photoelectron and negative photoelectron differently. Positive photoelectron and negative
photoelectron sway each other ceaselessly, taking a balance position as center, forming an electronic dipole of vibration.

Yu Benli’s thesis《Recovery of the Ether and Negation of the Theory of Relativity》which published in《Matter Regularity》No2, 2009 ,54-55. Makes a view point: Einstein dislikes“ether”,  but it has still been discovered by radio astronomer, It is just a problem of time that “ether”is accepted generally, the writer believe that it is the time to give a due status to the “ether”. We have worked out a correct summary and prediction about the basic characters of “ether” according to
the test result and basic theories. writer will clarify the basic character with five aspect……

Dr Cynthia Kolb Whitney is a American scientist, in whose thesis “Is Optical Detection of Linear Velocity Possible?”, ISSUE 69, 2006 · Infinite Energy. She described below:
And so possibly revive the nineteenth century concept of “luminiferous aether”. Any such revival would in turn support the development of twenty-first century concepts of  “physical ether”.