Big Bang Light Reveals Minimum Lifetime of Photons

The notion of the speed of light as the cosmic speed limit is based on the assumption that particles of light, called photons, have no mass. But astrophysical observations cannot rule out the slim chance that photons do have a tiny bit of mass—a prospect with wide ramifications in physics. For instance, if photons weigh nothing at all, they would be completely stable and could theoretically last forever. But if they do have a little mass, they could eventually decay into lighter particles. 

Where is the center of the universe?

Where is the center of the universe? Well, the answer is confusing: nowhere in particular and also in all...

To understand these things have to make one thing clear about the famous Big Bang: the famous big bang matter filled the empty space, in fact it was a very rapid expansion of space itself, which before the "bang" was fold completatamente on itself at a point of infinite density that scientists call unique .