Hi:

Thanks for the note. I think there are three keys- possibly more.

First, the photon in SRT/GR is a massed item. The mathematical model accepts 0 to infinity, but the equivalence proportion demands a finite (if vast) universe which is scaled to 10 to the minus 33rd Cm where our particulate (spin) universe loses its identity in the amorphous singular.

Secondly is this matter of scale. When we observe a photon, are we observing (and measuring) the entire universe from a distance?

Third is topology. As Pete noted, particles which enter amorphous or non-spin singularity bounce. In effect, they pass both event horizons, orbit the infinite and come back out- but NOT "right" back out, nor are the particles so affected left unchanged.

Particles entering a singularity (black hole) this way emerge in reversed polarity as part of a cosmological "big bang" on the other side of the universe and 60 billion years in the future.

Photons and singularity are the same substance in very different concentration. In that difference lies the meaning of scale, varying energy densities which define our reality, our perception of time- and the nature of momentum in GR.

Note that in a universe which starts from an everywhere/nowhere singularity ALL PARTICLES, EACH AND EVERY ONE, receive individual attention and endlessly go through this eternal process- thus perpetually organizing the cosmos- each particle...each atom of the universe at its own invariant frame of reference...passes singularity. Can it be any simpler?

Talk about stranger than science fiction!...yet the strangeness is not really strange at all...it is the result of a dimensional complexity we cannot perceive from our important, but cosmologically lowly frame.

PS At the end of my previous message, I said: "it is the result of a dimensional complexity we cannot perceive"...until we decide to look very carefully at ourselves in the shaving mirror...or at an Oak Tree, a Coconut Tree- or a fish! We look at, or rather, perhaps, BY the dimensional complexity of the universe every day of our lives.

Who is that; "immortal, invisible God only wise; in light, inaccessible, hid from our eyes"? Have we found the bridge between the rational and irrational, the physical and the metaphysical? I don't pretend to know....but maybe? Sam Cox