That is the element.
In Eteliria, elements are like the fundamental particles of their universe, the cornerstone of this world. Everything in this world is built from trillions of elements, which ultimately form their presence in the macroscopic world.
Therefore, it's reasonable to say that a combination of Starlight and elements constructs the world beyond the Stargate, because they only exhibit such forms in this world.
In fact, scientists from Earth have already discovered that when high-dimensional information—Starlight—is carried out of the Stargate, it reverts to its original form after separating from the Ether that only exists in 'Eteliria'.
Thus, we see the Glow Material and the high-dimensional information hidden within it.
