Originally posted by Raion
"Space is not empty". Yes, it is a vacuum, but I think now that humans can create a vacuum that is emptier than space, which means that the vacuum the humans create and space and still not completely empty. There is no nothingness now.
Whether the light came out or nothingness in the beginning may well have been, we may never know, since we only have instruments that can only look back so far, and then there is a gap and I do not think that anyone will be able to actually 'see' the early Universe of the Big Bang!
Different instruments may be used in the upper or lower limit of the electo-magnetic spectrum which is what Einstein worked with on his famous Law of Relativity and Special Relativity.
E= MC^2 is about the electro-magnetic spectrum.
Space is not empty, something like a hygrogen atom, (the basic building block of the Universe, the simplest atom) every something like 2.5cm.